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On a sunny day in Grapevine, Texas, three drones are buzzing around the head of a test dummy balanced on a pedestal. It's part of a demonstration outside the National School Safety Conference.

"We use drones to stop school shootings," says Justin Marston, the CEO of Campus Guardian Angel, the company selling the drones. In the event of a shooting, remote pilots fly the drones, housed at the school, at the shooter. They shoot pepper balls and run the drones into the shooter to debilitate them.

The technology is one example on a long list of products schools can buy to deter a shooter.

 since Columbine in 1999, according to an analysis by 

 at a Catholic school in Minneapolis. Two students were killed and at least 18 others were wounded.

In the wake of those shootings, an industry has emerged to try to protect schools — and business is booming. According to the market research firm Omdia, the school security industry is now worth as much as $4 billion, and it's projected to keep growing.

"The school safety and security industry has grown rapidly over the past decade," says Sonali Rajan, senior director with the research arm of Everytown for Gun Safety, which advocates for gun control. "The challenge right now is that these school safety products, the vast majority, have absolutely no evidence guiding their effectiveness."

Inside the school safety conference, vendors in an expo hall showcase panic buttons, bullet-resistant whiteboards, facial recognition technology, training simulators, body armor, guns and tasers.

Tom McDermott, with the metal detector manufacturer CEIA USA, says schools used to be a small fraction of their U.S. business. Now they're the majority.

"It's not right. We need to solve this problem. It's good for business, but we don't need to be selling to schools," McDermott says.

Sarah McNeeley, a sales manager with SAM Medical, is selling trauma kits, which include tourniquets, clotting agents and chest seals. She says their customers are traditionally EMTs, fire departments, and military medics, but increasingly, school districts.

"Being prepared and having these devices in the schools is essential," she says. "Some people want to put their heads in the sand and pretend like it's not going to happen to them."

The expo hall is just one part of the conference, organized by the National Association of School Resource Officers, or NASRO. The group also trains school-based police officers on a variety of topics, including how to work with kids who have experienced trauma, and how to intervene before violence occurs.

Sarah Mendoza, a school resource officer in Yoakum, Texas, who attended the conference, says she finds that aspect most meaningful.

"I just sit there and I talk to them and I listen," she says of working with students. "My connection with the kids is so important because they're the ones who are going to come and tell me, 'Hey Mendoza, this is what's going on. Can you help us?' or 'Hey Mendoza, this is how I'm feeling today. What can I do to make myself better?'"

Mo Canady, the executive director of NASRO and a former police officer, says school resource officers are in one of the most challenging policing roles.

"We're asking a lot of that officer. We're asking them to be the best tactical person their department could offer," Canady says. "We're asking them to be the best informal counselor."

But when a shooting happens, he says school resource officers need any tools they can get.

Gun violence experts say simple things like locked doors can make a difference. Authorities say that likely 

 last month in Minneapolis. But a locked door doesn't necessarily prevent a shooting.

Researchers say investing in school communities that promote a culture of 

, are key to preventing gun violence, as most school shooters are 

current or former students and are suicidal

Jillian Peterson, who leads the Violence Prevention Project Research Center at Hamline University, has interviewed people who planned a school shooting, but didn't carry it out. She said there are often two key reasons they change their minds: The first is that they had trouble accessing a firearm – which is why, she says, 

The other is that someone helped a young person find hope while they were in crisis.

"We're spending billions of dollars that could be going to mental health or counselors, all the stuff that we know creates inclusion," Peterson says.

Still, she says, she understands the allure of an impenetrable school.

"I think it preys on people's worst fears," she says. "How do you say no to something if you're telling me it might save my kid's life? Of course I want that thing."

She said trying to buy safety feels very American, just like school shootings.

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The effort to keep schools safe from mass shooters has ballooned into a multibillion dollar industry. Companies are selling school districts assurance with high-tech products. 

The effort to keep schools safe is an industry worth billions — and it keeps growing

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