The expo had finally begun, and now hundreds of school administrators streamed into a sprawling, chandeliered ballroom where entrepreneurs awaited, each eager to explain why their product, above all others, was the one worth buying.

Waiters in white button-downs poured glasses of chardonnay and served meatballs wrapped with bacon. In one corner, guests posed with colorful boas and silly hats at a photo booth as a band played Jimmy Buffett covers to the rhythm of a steel drum. For a moment, the festive summer scene, in a hotel 10 miles from Walt Disney World, masked what had brought them all there.

This was the thriving business of campus safety, an industry ­fueled by an overwhelmingly American form of violence: school shootings.

At one booth, two gray-haired men were selling a 300-pound ballistic whiteboard — adorned with adorable animal illustrations and pocked with five bullet holes — that cost more than $2,900.

“What we want to do is just to give the kids, the teachers, a chance,” one of them said.

“So they can buy a few minutes,” the other added.

Elsewhere at the July conference, vendors peddled tourniquets and pepper-ball guns, facial-recognition software and a security proposal that would turn former Special Operations officers into undercover teachers. Threaded into every pitch, just five months after a Parkland, Fla., massacre, was the implication that their product or service would make students safer — that, if purchased, it might save a life.

What few of the salespeople could offer, however, was proof.

Although school security has grown into a $2.7 billion market — an estimate that does not account for the billions more spent on armed campus police officers — little research has been done on which safety measures do and do not protect students from gun violence. Earlier this fall, The Washington Post sent surveys to every school in its database that had endured a shooting of some kind since the 2012 killings of 20 first-graders in Newtown, Conn., which prompted a surge of security spending by districts across the country.

Superintendent Randy Russell checks camera feeds at Freeman High School in Rockford, Wash., which spent about $200,000 on new security after a deadly shooting last year. (Rajah Bose/For The Washington Post)

Of the 79 schools contacted, 34 provided answers, including Sandy Hook Elementary. Their responses to questions about what they learned — some brief but many rich in detail — provide valuable insight from administrators in urban, suburban and rural districts who, as a group, have faced the full spectrum of campus gun violence: targeted, indiscriminate, accidental and self-inflicted.

When asked what, if anything, could have prevented the shootings at their schools, nearly half replied that there was nothing they could have done. Several, however, emphasized the critical importance of their staffs developing deep, trusting relationships with students, who often hear about threats before teachers do.

Only one school suggested that any kind of safety technology might have made a difference. Many had robust security plans already in place but still couldn’t stop the incidents.

In 2016, Utah’s Union Middle School had a surveillance system, external doors that could be accessed only with IDs and an armed policewoman, known as a resource officer, when a 14-year-old boy shot another student twice in the head during a confrontation outside the building just after classes ended.

“Even if we would have had metal detectors, it would not have mattered,” wrote Jeffrey P. Haney, district spokesman. “If we would have had armed guards at the entrance of the school, it would not have mattered. If we would have required students to have see-through backpacks and bags, it would not have mattered.”

Excerpts from Union Middle School’s survey responses

Sandy, Utah

On Oct. 25, 2016, a 14-year-old boy shot an older teen twice in the head during an after-school confrontation. The following responses were provided by Canyons School District Spokesman Jeffrey P. Haney.

What type of drills, if any, had the school done before the shooting (classic lockdown, active-shooter, ALICE or something else), and how often had they been practiced?

“Union Middle, an 830-student school of sixth, seventh and eighth graders, has completed at least four emergency-preparedness drills a year since 2009…. The school conducted a drill for a ‘lockdown,’ which is called when there is a direct threat to campus, on Sept. 21, 2016, roughly one month before the traumatic incident on campus.”

What other types of safety measures, if any, did the school have in place before the shooting (metal detectors, SROs, special door locks, pepper spray, armed teachers, etc.)?

“Union Middle, built in 1968, has been retrofitted with security measures such as a surveillance system, ID-access-only external doors, and the presence of a certified and armed School Resource Officer whose salary is co-funded by Canyons School District. In addition, the school conducted regular safety drills.”

Did students and staff follow the drilling procedures they’d practiced?

“Yes. The students followed the directions of the administrators, counselors and teachers who responded to the incident. The students were immediately shepherded into classrooms and warned to take cover away from windows and doors until told otherwise. After students were safely inside the building, the doors were locked to safeguard those inside the school from external threats.”

What ultimately ended the shooting?

“A teacher who had been assigned to after-school duty was the first on the scene after she started walking toward a group of students who were gathering as if they were going to watch a fight. She heard a sound, and then began running toward the group of students. As she ran, she saw a student with a weapon. Some students yelled, ‘This is a prank,’ but as she approached, she realized that one student was severely injured. At that point, the boy with the handgun slumped to the ground.”

In retrospect, what — if anything — do you believe could have been done to stop the shooting from happening at all?

“At this point, we’re focusing on preparation. Students and teachers must know how to respond to all kinds of emergency situations. Yes, it’s unfortunate, but that’s where we are. We operate under the assumption that tragedy can strike anywhere, if someone is determined to cause damage.”

What safety measures were put in place after the shooting?

“Canyons District this year… is giving all teachers access to a mobile app called DIR-S, which provides the ability to immediately alert authorities to any incident that is happening in their sections of the school. The District is redoubling efforts to train students to use a mobile app called SafeUT, an all-day and all-night link to administrators and licensed counselors at the University of Utah.”

What did you learn from the shooting?

“We believe all students should feel welcome in our schools. Our principals, counselors, psychologists, and teachers are working hard to make sure each school has a positive and inviting environment. Starting this year, a school psychologist and/or social worker has been assigned to every Canyons District school to support faculty and staff in reinforcing positive behavior and creating a culture of inclusivity.”

The survey responses are consistent with a federally funded 2016 study by Johns Hopkins University that concluded there was “limited and conflicting evidence in the literature on the short- and long-term effectiveness of school safety technology.”

The schools that have experienced gun violence consistently cited simple, well-established safety measures as most effective at minimizing harm: drills that teach rapid lockdown and evacuation strategies, doors that can be secured in seconds and resource officers, or other adults, who act quickly.

But fear has long dictated what schools invest in, and although campus shootings remain extremely rare, many superintendents are under intense pressure from parents to do something — anything — to make their kids safer. It was the nation’s renewed anxiety, after 17 people were killed at Marjory Stoneman Douglas High in February, that had drawn so many administrators to the National School Safety Conference at the Florida hotel, 200 miles north of Parkland.

People wait to hear from students after the shooting at Marjory Stoneman Douglas High School in Parkland, Fla., in February. (Amy Beth Bennett/South Florida Sun-Sentinel/AP)

Also there, hoping to capture some piece of the new spending, were 105 vendors, an all-time high for the expo and a 75 percent increase over the previous year.

“This is our first school conference that we’ve ever done,” said SAM Medical sales director Denise Ehlert, who, at one point that evening, knelt down and encouraged a 6-year-old girl to tighten a tourniquet on a woman’s arm as a way to demonstrate that anyone could do it.

“This is brand new. . . . This is our first show,” said Paul Noe, who had come to sell a high-tech, armored classroom door that, for the price of $4,000, he claimed could stop bullets, identify the weapon, photograph the shooter and notify police. The bright yellow one they’d put on display had been shot 57 times.

Bullets stopped by this armored classroom door, which costs up to $4,000, are marked by the style and caliber of the weapon that fired them. (Cassi Alexandra/For The Washington Post)

“We just released it in the past couple of months to be available to schools, and we’ve been obviously overwhelmed with interest,” said Monte Scott, who sells guns that fire balls packed with a potent pepper mixture meant to disable a shooter. Scott had just returned from training U.S. troops in Afghanistan on how to use the weapons in a combat zone.

Echoing a frequent refrain at the expo, Justin Kuhn said his own children, not money, led him to found his company, which produces an elaborate door-security and weapons-detection system.

Although Kuhn, who had previously invented a scraper blade and a car wax, acknowledged he didn’t know whether his new product would have stopped the attack at Stoneman Douglas, he had still tried to leverage the bloodshed. Standing next to his company’s 2,500-pound aluminum-framed vestibule, he recalled a meeting in Indiana with one district’s head of school safety who had noted that the price tag for Kuhn’s entire system seemed steep.

“If you think $500,000 is expensive, go down to Parkland, Florida, and tell 17 people $500,000 is expensive. That’s $29,000 a kid,” Kuhn recalled saying. “Every person would pay $29,000 a kid to have their kid alive.”

Freeman High upgraded its cameras to high definition after last year’s shooting. (Rajah Bose/For The Washington Post)

By this spring, Huffman High in Birmingham, Ala., had, in security parlance, been “hardened,” a term that in recent years has migrated from anti-terrorism circles to school board meetings. Surveillance cameras were mounted inside and out, and Huffman’s 1,370 students were periodically checked for weapons, both with handheld and walk-through metal detectors, administrators say. Three resource officers patrolled the hallways.

But none of those measures saved the life of Courtlin Arrington, a senior who was about to leave school one afternoon in March when a boy showing off a handgun unintentionally fired it, sending a round through the girl’s chest two months before her graduation.

How the weapon got into Huffman remains unclear — Arrington’s family has sued the district, limiting what administrators can say — but the incident highlights a theme that appears throughout the survey responses: No amount of investment in security can guarantee a school protection from gun violence.

Much of what can be done to prevent harm is beyond any school’s control because, in a country with more guns — nearly 400 million — than people, children are at risk of being shot no matter where they are. A 2016 study in the American Journal of Medicine found that, among high-income nations, 91 percent of children younger than 15 who were killed by gunfire lived in the United States.

But several administrators did point to specific steps that at least contained the attacks on their schools.

At Florida’s Forest High in April, for example, teachers and teens who had undergone safety training locked classroom doors and barricaded them with chairs and desks just seconds after realizing that a man with a shotgun was in the hallway. He fired through one door and wounded a student but surrendered shortly after failing to get inside.

A month later, at Dixon High in Illinois, resource officer Mark Dallas heard shots near the school gym, rushed toward the noise and in, an exchange of gunfire, struck the shooter, who was quickly arrested.

Increased spending on school resource officers

After the February shooting in Parkland, many school districts in Florida sharply increased the amount they spent per school year for armed officers.

Highlands County

St. Lucie County

$1.6M

$1.1M

Parkland

shooting

$472K

$400K

’15-’16

’18-’19

’15-’16

’18-’19

Suwannee County

Madison County

$396K

$310K

$180K

$121K

’15-’16

’18-’19

’18-’19

’15-’16

Increased spending on school resource officers

After the February shooting in Parkland, many school districts in Florida sharply increased the amount they spent per school year for armed officers.

Highlands County

St. Lucie County

$1.6M

$1.1M

Parkland

shooting

$472K

$400K

2015-2016

2018-2019

’15-’16

’18-’19

Suwannee County

Madison County

$396K

$310K

$180K

$121K

’15-’16

’18-’19

’18-’19

’15-’16

Increased spending on school resource officers

After the February shooting in Parkland, many school districts in Florida sharply increased the amount they spent per school year for armed officers.

Highlands County

St. Lucie County

$1.6M

$1.1M

Parkland

shooting

$472K

$400K

2015-2016

2018-2019

’15-’16

’18-’19

Suwannee County

Madison County

$396K

$310K

$180K

$121K

’15-’16

’18-’19

’18-’19

’15-’16

Union County

DeSoto County

$249K

$206K

$81K

$45K

’15-’16

’18-’19

’18-’19

’15-’16

Increased spending on school resource officers

After the February shooting in Parkland, many school districts in Florida sharply increased the amount they spent per school year for armed officers.

Highlands County

St. Lucie County

Suwannee County

$1.6M

$1.1M

Parkland

shooting

$472K

$400K

$396K

$180K

2015-2016

2018-2019

’15-’16

’18-’19

’15-’16

’18-’19

Madison County

Union County

DeSoto County

$310K

$249K

$206K

$121K

$81K

$45K

’18-’19

’15-’16

’15-’16

’18-’19

’18-’19

’15-’16

Increased spending on school resource officers

After the February shooting in Parkland, many school districts in Florida sharply increased the amount they spent per school year for armed officers.

St. Lucie County

Highlands County

Suwannee County

$1.6M

$1.1M

Parkland

shooting

$472K

$396K

$400K

$180K

2015-2016

2018-2019

’15-’16

’18-’19

’15-’16

’18-’19

Madison County

Union County

DeSoto County

$310K

$249K

$206K

$121K

$81K

$45K

’15-’16

’18-’19

’18-’19

’15-’16

’15-’16

’18-’19

Seven of the 23 surveyed schools that had officers at the time of their shootings indicated that they played a direct role in limiting the harm done. Still, what Dallas did is exceedingly rare. The Post’s analysis identified just one other case over the past 19 years in which a resource officer gunned down an active shooter. (To put that in perspective, at least seven shootings in the same period were halted by malfunctioning weapons or by the gunman’s inability to handle them.)

While the mere presence of the officers may deter some gun violence, The Post found that, in dozens of cases, it didn’t: Among the more than 225 incidents on campuses since 1999, at least 40 percent of the affected schools employed an officer.

Beyond armed security or any other particular safety measure, survey respondents emphasized that nothing was more important to minimizing the violence than preparation.

This Northern California school responded to a November 2017 shooting by locking down in less than a minute. The gunman fired more than 100 rounds at the buildings but could not enter. (Elijah Nouvelage/AFP/Getty Images)

Last November, staff at Rancho Tehama Elementary, a school in rural Northern California, heard what sounded like gunshots and hustled the children outside into the building. All students and staff had locked down, something they regularly practiced, 48 seconds after a secretary called for it — and just 10 seconds before a man with an AR-15-style rifle reached the quad. The gunman, who had already killed five people during his rampage, fired more than 100 rounds, shattering glass and tearing holes in walls.

He tried to enter classrooms and the main office, but all were secured. Six minutes after arriving, he gave up and left, taking his own life a short time later. One student, age 6, was wounded but survived.

Excerpts from Rancho Tehama Elementary School’s survey responses

Corning, California

On Nov. 14, 2017, a 44-year-old man with a ‘homemade’ AR-15-style rifle went on a lengthy shooting rampage in Northern California and, after arriving at the school, fired more than 100 shots, wounding a 6-year-old boy who was hiding inside one building. The following responses were provided by Corning Union Elementary School District Superintendent Richard Fitzpatrick.

What type of drills, if any, had the school done before the shooting (classic lockdown, active-shooter, ALICE or something else), and how often had they been practiced?

“Since Sandy Hook, the district has conducted lockdown drills regularly... It should be noted that these drills were done with consistent behaviors and language, regardless of the perceived threat. They also varied based on the location of the threat…. Crucial to the survival of our students in the shooting, any adult employee is empowered to trigger a lock-down.”

What other types of safety measures, if any, did the school have in place before the shooting (metal detectors, SROs, special door locks, pepper spray, armed teachers, etc.)?

“All schools in the district were equipped with ‘lock blocks.’ These devices allow keyless locking from inside in less than a second. All playground aides and office staff also had walkie-talkies, which were utilized during the shooting.”

Did students and staff follow the drilling procedures they’d practiced?

“Flawlessly. The campus was completely locked down within 48 seconds of it being called.”

What ultimately ended the shooting?

“After firing over a hundred rounds of 5.56 mm at the buildings, the shooter became frustrated by his inability to gain access to the school. He left and, some minutes later when confronted by law enforcement, took his own life.”

Did any of the safety measures specifically work — meaning, they kept students safe from harm — and if so, which ones?

“Yes. Lockdown and lock-blocks prevented any loss of life. One kindergarten student was shot through a building wall in the chest and foot. He recovered. There were no other injuries on campus, despite six fatalities in the incident in other areas of the town.”

In retrospect, what — if anything — do you believe could have been done to stop the shooting from happening at all?

“Sensible gun control. The shooter had an AR rifle which he purchased online in parts. A ‘ghost’ gun. He was prohibited by the courts from owning or possessing firearms.”

What safety measures were put in place after the shooting?

“The shooter rammed a locked gate to gain entry to the school. His truck was stuck in the gate, delaying his ability to access the school quad. This allowed the valuable seconds to complete the process. A six-foot wrought iron fence was installed in the front of the school, which previously had a three-foot fence. An armed security guard is now present at the school during all school hours.”

What did you learn from the shooting?

“We are largely powerless from determined shooters with high-capacity, high-velocity, semiautomatic assault rifles. Bullets from a 5.56 mm rifle easily penetrated sealed windows, doors, cabinets and walls. But lockdowns can save lives.”

The school’s security plan worked “flawlessly,” wrote Superintendent Richard Fitzpatrick, but that didn’t diminish the indignation he felt that his students and staff had suffered through the terror — and that so little had been to done ensure someone else couldn’t attempt to do the same thing, there or at any other American school.

The attacker, who had been stripped of his guns by a judge, had built the weapons he used with parts, many of which are readily available online.

Without what Fitzpatrick called “sensible gun control . . . We are largely powerless from determined shooters with high-capacity, high-velocity, semi- ­automatic assault rifles.”

This Orlando expo for school security products had a record 105 vendors in July, 75 percent more than last year’s. (Cassi Alexandra/For The Washington Post)

The idea for Jordan Goudreau’s business came to him in Puerto Rico, where he had traveled to work in private security in the aftermath of Hurricane Maria. Goudreau, a U.S. Army combat veteran, was making lots of money on the island, he said, but the new opportunity was too enticing to pass up.

“I saw Parkland, and I was like, ‘Well, nobody’s really tackling this, so I want to fix this,’ ” Goudreau explained at the expo in Florida, where the state legislature had just committed more than a quarter-billion dollars to school safety.

The solution, Goudreau concluded, was to embed former Special Operations agents, posing as teachers, inside schools. He argued that the benefits over resource officers were obvious.

First, because the children wouldn’t know who his guys really are (or that they’re armed and adept at counterterrorism tactics), students would be more likely to open up, giving agents a chance to glean information that could expose a potential threat.

“He’s just a — he’s a cool shop teacher: ‘Hey, what’s up, fellas,’ ” said Goudreau, 42, envisioning a potential conversation with a child. “I go sit down with a kid who’s alone, playing ‘Dungeons and Dragons,’ and I just try to see whether there’s any problems.”

Second, Goudreau said, his men all thrive in combat and could quickly snipe a shooter.

“The beauty of it is it’s all for the price of a Netflix subscription, so it’s really hard to argue with me about, ‘Well, it costs too much.’ You can’t tell me that,” insisted Goudreau, hair buzzed and jaw square.

Jordan Goudreau wants to charge parents $8.99 a month to embed former Special Operations agents inside schools. (Cassi Alexandra/For The Washington Post)

No schools had yet signed on for the program, and he still hadn’t worked out a number of the business plan’s precise details, but Goudreau was certain that he wanted to bill the parents of each student directly (for $8.99 a month) so his staff could remain independent from any district’s “chain of command.”

When the media relations liaison standing beside him at their booth suggested that, if necessary, they could go through school boards and accept government money, Goudreau cut him off.

“But we don’t want to. We don’t want that,” he said. “We want private money, because it’s faster.”

Among the many challenges educators face in trying to protect their students from harm is determining what product, or person, to trust.

These guns fire balls packed with a potent pepper mixture meant to disable a shooter. (Cassi Alexandra/For The Washington Post) A saleswoman from SAM Medical shows a tourniquet at the expo in Orlando. (Cassi Alexandra/For The Washington Post)

As Home Depot and Walmart market $150 bulletproof backpacks to frightened parents, administrators are being inundated with pitches from entrepreneurs pushing new concepts that make grand promises. One superintendent who responded to the survey said that within hours of a shooting earlier this year, her inbox was “flooded from vendors with some pretty disrespectful and tacky statements: ‘had you had this . . .’; ‘if you had this . . .’ ”

The industry is also rife with self-appointed experts and consultants who claim to know what safety measures are most effective, but given that so little government or academic research has been done on what insulates students from on-campus gun violence, it’s enormously difficult for schools to reach conclusions based in fact.

“Decisions about whether to invest in school security technology for a school or school district are complex,” the Johns Hopkins study said. “Many choices about the technology selected, however, may be made with incomplete information or with information that is influenced more by political or reactionary consideration than by local conditions.”

Superintendent Randy Russell checks in to Freeman High’s sign-in system, which can run real-time background checks. (Rajah Bose/For The Washington Post)

For administrators at the expo, trying to understand which vendors were true authorities was especially tricky, in part because, like Goudreau, dozens had worked in other industries before pivoting to school security.

Joe Taylor, co-founder of Nightlock, created a residential door barricade 15 years ago after someone tried to break into his parents’ home. Back then, he never envisioned producing a version for classrooms. Now, schools make up 95 percent of his business.

As he explained that the company had made the transition after being bombarded with requests following the Sandy Hook shooting, a man approached his booth.

“I just bought about $7,000 worth of these,” said Cas Gant, an assistant principal from a charter school in Panama City, Fla.

Taylor noted that, at one point, his devices were back-ordered nearly two months.

Nightlock owner Joe Taylor, center, sells 95 percent of his company’s door barricades to schools. (Cassi Alexandra/For The Washington Post)

“Right after the Parkland shooting —” he said, pausing.

“A surge?” asked Gant’s wife, Desiree.

“There was a big surge,” he said. “But we’re finally caught up.”

“That’s good,” she said. “Anything to keep our babies safe.”

As the men continued discussing the door lock, Desiree looked around, taking in the scene. Her husband had attended school safety expos before, but this was her first.

“This is sad. I came in here with my mouth wide open,” she murmured. “Isn’t it scary that we literally have to go through this — that all of these vendors are here?”

Carl Manna, an assistant principal at another Florida high school, felt the same way as he wandered the room, though none of this was new to him.

At one booth, he paused to stare at a photo from Forest High showing the desks and chairs that had been stacked to the classroom’s ceiling to keep the gunman out. Months earlier, Manna had pretended to be an active shooter in a training video his school produced.

“That,” he said, “is what the room looked like after I left.”

“ALICE” training is a set of strategies developed by an Ohio-based company that teaches students and staff how to respond to active shooters. (Amber Ferguson/The Washington Post)

The video opens with Manna, in jeans and a dark hoodie, stalking Branford High’s hallways. In his right hand, he holds a water pistol wrapped with black tape.

Manna, also the narrator, explains that the video would review “ALICE” training, a set of strategies developed by an Ohio-based company that teaches people how to respond to active shooters. The acronym stands for Alert, Lockdown, Inform, Counter and Evacuate. “The proper use of these five steps could save your life,” he says, as the video illustrates a series of widely accepted approaches to staying safe in an active-shooter situation.

Then, at the 2:13 mark, a plastic Germ-X hand sanitizer bottle appears on the screen, followed by a 20-ounce Mountain Dew, a travel mug and an Adobe Photoshop hardcover textbook.

“Once you have locked and barricaded the door, quickly move to an area out of sight,” Manna says. “Grab several items you can use to protect yourself. Every room is equipped with something that could distract and defend against the aggressor.”

Seconds later, the video shows Manna and a disguised administrator at another high school each entering classrooms, their guns raised. When Manna walks in, he’s bombarded with flying bottles, books and a backpack before the teenagers rush him. In the other video, kids tackle the man to the floor directly beneath an American flag mounted to the wall.

This is what the ALICE Training Institute describes as “counter.”

The drills have grown in popularity in recent years, and many schools, including some of those surveyed, have credited its conventional lockdown and evacuation training with saving the lives of students and staff. But numerous ALICE critics — including consultants, school psychologists, safety experts and parents — have argued that teaching children to physically confront gunmen, under any circumstances, is dangerous and irresponsible.

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“What if the person is ex-military or the person has police training, and you’re teaching the student to throw a can of green beans or attack?” asked Joe E. Carter, vice president of business development and marketing at United Educators, an insurance company that covers more than 800 K-12 schools around the country. “I haven’t seen any data out there — real data — that this is something that makes it safer.”

Representatives from ALICE, which was founded by a former police officer, insist that the counter strategies should be used as a last resort and that schools are responsible for deciding what’s suitable for their students. Colleen Lerch, a marketing specialist at the company, said their instructors recommend “SWARM” techniques — in which kids may gang tackle shooters — only to students who are at least 13 or 14 years old.

“At this age, it is statistically very high that the shooter will be the same age as potential victims. A room full of 14 year old’s can easily control another 14 year old,” Lerch asserted in an email to The Post, though she provided no evidence to support either claim.

In fact, a third of shooters who attack middle and high schools are older than their victims, according to a Post analysis. Also, while The Post found that adults who were not members of law enforcement have subdued more than a dozen school shooters over the past 19 years — including on at least three campuses that underwent ALICE training — the company could not point to a single case in which students used its counter techniques to take down a gunman.

Parents and students leave Freeman High near Spokane, Wash., after last year’s shooting. (Colin Mulvany/Spokesman-Review)

On multiple occasions, however, students who have confronted armed attackers, whether on purpose or accidentally, have been killed or wounded. Last year, a 15-year-old boy was shot to death at Freeman High, just outside Spokane in rural Rockford, Wash., after he tried to stop an armed student in the hallway. Three months later, a 17-year-old was killed when he came upon a gunman in the bathroom who was readying an attack at Aztec High in New Mexico, and a 17-year-old girl was wounded when she did the same thing at Alpine High in Texas two years ago.

Excerpts from Aztec High School’s survey responses

Aztec, New Mexico

On Dec. 7, 2017, a 21-year-old man with a Glock 9mm semiautomatic handgun shot and killed two students before firing at others and eventually killing himself. The following responses were provided by the Aztec Municipal School District.

What type of drills, if any, had the school done before the shooting (classic lockdown, active-shooter, ALICE or something else), and how often had they been practiced?

“Our school had done lockdown drills, shelter in place, fire drills, etc. Our district has been actively involved in tabletops and live drills over the past 10 years and has a great relationship with the Emergency Management Office of San Juan County. At these tabletops, all the other local school districts in our county also participate, so we were prepared because of many years of drills and scenarios.”

What other types of safety measures, if any, did the school have in place before the shooting (metal detectors, SROs, special door locks, pepper spray, armed teachers, etc.)?

“We have access controls, which means we could and did lock all outside doors once the event started. Our standard procedure is all classroom doors are locked all day.”

Had the school worked with an outside safety consultant of any kind before the shooting?

“Yes we have done extensive work with San Juan County Emergency Management Office. For over 10 years, we have had monthly safety meetings with a committee that involves different agencies and reps from the other school districts in the county. In addition we have conducted and attended tabletops with different scenarios, including active shooter…. In addition, we had Homeland Security do a safety audit of our campus several years ago.”

What ultimately ended the shooting?

“Self-inflicted gunshot wound. There was a fast response by local law enforcement and the shooter could not get into rooms and police arrived on scene within 3.5 minutes and as a result of this he shot himself.”

Did any of the safety measures specifically work — meaning, they kept students safe from harm — and if so, which ones?

“Hide measures and locked doors so the shooter could not get in the room. In addition during the event fire alarms went off, but we are trained not to exit and when this happened administration got on intercom and gave instructions not to exit the rooms.”

In retrospect, what — if anything — do you believe could have been done to stop the shooting from happening at all?

“Not sure anything could have stopped the evil coward from committing this act of violence.”

What safety measures were put in place after the shooting?

“Security, both armed and partially armed. Student badges and we are now applying for grants to try and limit the number of access points onto the campus. It is a wide open campus that sits on 11 acres and has a city street that runs through it that separates it into two different parts. In addition there are many buildings that are separated from one another.”

What did you learn from the shooting?

“Preparation in advance was key as teachers and staff reacted and did not have to think about what to do. That saved a lot of lives on that day. Radios are key in communication as that is what started the lockdown as it came from a custodian. Training in advance from all stakeholders is huge, things like incident command training, doing drills, ensuring you have relationships and collaboration with all emergency entities….”

Malcolm Hines, head of safety for the Florida district where Manna participated in the active-shooter video, understood criticisms of the counter training but said he also suspected some parents would object if the kids weren’t taught how to defend themselves.

“This is an option for them to at least fight back,” said Hines, whose district has paid ALICE more than $7,500 since late last year.

In numerous ALICE training videos online, the plan always works to perfection: Students pelt the faux shooter with objects the moment he appears, then — without hesi­ta­tion — several kids charge the intruder, easily bringing him to the ground before he fires a shot.

It’s ludicrous, critics say, to think that children would behave with such decisiveness and precision if they were facing a real gunman.

“There is no research/evidence . . . that teaching students to attack a shooter is either effective or safe,” Katherine C. Cowan, spokeswoman for the National Association of School Psychologists, wrote in a statement to The Post. “It presumes an ability to transform psychologically from a frightened kid to an attacker in the moment of crisis, the ability to successfully execute the attack on the shooter (e.g., hit the shooter with the book or rock, knock them down, etc.) again in a crisis situation, the ability to not accidentally hurt a classmate, the reality that unsuccessfully going on the attack might make that student a more likely target of the shooter.”

A memorial for the victims of the Sandy Hook massacre outside a home in Newtown, Conn., in 2013. (Robert F. Bukaty/AP)

Nicole Hockley, whose 6-year-old son, Dylan, was killed at Sandy Hook Elementary in 2012, concluded long ago that much of America looks at school safety the wrong way.

“It’s so much focus on imminent danger and what you do in the moment,” she said, “as opposed to what you do to stop it from happening in the first place.”

Hockley and her colleagues at Sandy Hook Promise, a nonprofit she co-founded, have argued that reforming gun laws would make a difference, but she knows that there are other, perhaps more attainable, ways to prevent harm, too. In March, her organization launched the Say Something Anonymous Reporting System, which allows users to privately submit safety concerns through a computer, phone or app.

Because many, if not most, shooters offer some indication of their intentions through comments to friends or online, Hockley has for years encouraged students to speak up if they’re aware of a potential threat. Often, though, kids said that they feared repercussions, a concern that the anonymity should alleviate.

The service, which is free and will be adopted by more than 650 districts by January, has already produced meaningful results.

Nicole Hockley, shown with husband Ian in 2013, co-founded Sandy Hook Promise, which launched a system to discreetly report safety concerns. (Jessica Hill/AP)

At the start of this school year, the organization said, a tipster informed the crisis center that a student who might have access to guns had talked about shooting gay classmates. Staff immediately contacted local law enforcement and school district leaders, who intervened. In another case, someone reported that an eighth-grade friend was cutting herself and considering suicide. Sandy Hook Promise said the girl is now receiving treatment.

The system and others like it address what several of the surveyed schools said was the only thing that could have stopped the shootings on their campuses: a tip from someone who knew it might happen.

No one at a South Carolina school knew that a former student would drive there and open fire on the playground two years ago, but afterward, the superintendent in Anderson County, Joanne Avery, fixated on finding another way to keep her kids safe.

Avery overhauled the school system’s safety measures after the shooting, adding resource officers, increasing the number of active-shooter drills, installing trauma kits, updating surveillance systems and providing receptionists with panic buttons.

She changed one district practice, too.

The shooter, who was 14 at the time, had been expelled from a middle school in a neighboring district after making threats and bringing a hatchet in his bag. It was then, in his isolation as a home-schooler, that he became obsessed with mass murderers and planned his attack on Townville Elementary.

So, early this year, when the principal at one of her schools asked to expel a student who’d talked on social media about bludgeoning classmates, Avery said no.

“I’m not just going to expel him and be done with him,” she recalled telling the principal. “You’re going to increase your chances of that person coming back to your school and doing harm.”

Instead, Avery met with the sheriff’s office, a prosecutor and the area’s executive director for mental health.

“We’ve got to do something for these kind of kids,” she told them, and what they did was conduct a criminal investigation, charge the boy and set a court date.

She attended, and although the student’s mother argued that he should be released, Avery had told the prosecutor she wanted to make sure he got help. The judge listened, sending him to juvenile detention and ordering that he undergo a mental health evaluation and receive counseling.

Months later, at another hearing, the boy’s mother argued again that he should be released. Avery didn’t oppose that, but again, she asked that he continue to receive support. And again, the judge listened, sending the boy to an alternative school and ordering that he and his mother receive additional counseling. A probation officer was also assigned to check on him every week.

Avery doesn’t know whether the boy ever would have carried out his threats. But she witnessed the damage caused by 12 seconds of gunfire — a first-grader dead, survivors overcome with trauma, a community splintered — and she does know what her time and effort cost: nothing.

About this story

Video editing by Amber Ferguson. Graphic by Danielle Rindler. Design and development by Courtney Kan.

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