It was a little after 2 p.m. in August 2007 at Booker T. Washington High School in Memphis when a young man entered the building, pulled out a handgun and said, “Everybody get on the ground.”

Earlier that day, he’d threatened school officials who escorted him out of the building as a part of his pending expulsion from the school.

Instead of shooting anyone, the young man bolted out a door of the wood shop classroom. He was quickly arrested about a half-mile from the school, according to a police report.

That event received little public attention. A 2017 fight outside a Rutherford County elementary school on orientation day also went largely unnoticed. A student’s mother reportedly pulled a handgun on the student’s father in the school parking lot, but no shots were fired.

Few likely remember in 2001 when a 57-year-old man walked into a psychiatrist’s office at East Tennessee State University armed with two handguns and said his wife was “out to get him.” Police responded after he refused to hand over his weapons to psychiatrists.

Mass killings — generally defined as attacks in which four or more people are killed — at schools are meticulously chronicled. Victims are remembered, motives are studied, new policies or laws are discussed. The horror burrows into the memories of viewers and readers around the world.

Yet near misses — incidents in which a student or adult has a real firearm (as opposed to a BB or toy gun) or other gun at a school but does not carry out a mass attack — happen in Tennessee public schools at far greater rates than most other states, according to a USA TODAY NETWORK - Tennessee analysis.

From 2001 to 2017, there were 10 slayings at Tennessee schools involving a gun, according to the statistics from the Tennessee Bureau of Investigation and Metro Nashville Police.

During the same period, TBI data shows almost 1,700 Tennessee law enforcement reports involving guns or threats of guns at schools or colleges — nearly once every three days.

The USA TODAY NETWORK - Tennessee reviewed 300 police reports filed in response to those threats. Not every reported threat involved a real firearm at a school.

But the rate of students having guns at Tennessee schools exceeded the national average every school year from 2009 to 2015, according to federal education statistics. The Tennessee rate was more than double the national average during five of those seven years.

Although data from state and federal agencies on the frequency of guns in schools in Tennessee doesn’t always match, and media reports have exposed the unreliability of data on shootings and guns in schools, a review of the available information points to the same conclusion: Tennessee is an outlier when it comes to guns in schools.

Why do kids bring guns to schools?

A 6-year-old boy in Memphis told teachers he found the handgun he brought to school in 2006 while looking inside his stepfather’s shoe.

A Nashville high school student said in May 2017 he had a SIG Sauer 9 mm handgun in the pouch of his sweatshirt because he needed to protect himself walking home from the bus stop.

A 16-year-old male student at William Blount High School in Blount County told police in 2003 he brought a handgun to school to try and sell it. He stole it from his mom’s friend after finding it between couch cushions.

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Kimberly Brown, a Vanderbilt University professor and director of the local forensic evaluation team, tasked with conducting adult and juvenile court-ordered mental health evaluations in Davidson County, said she was surprised by the number of times officers responded to threats of a gun in a Tennessee school.

There’s no simple explanation as to why a student decides to bring a weapon to school, but young people frequently show poor judgment, she said.

“They don’t think things through like adults do. Their brains are in a constant stage of development, especially for males, that’s not going to be complete until their mid-20s,” Brown said.

“Kids do not appreciate the risks, especially long term, that adults can see. Their brains are just not wired that way at that age.”

Exposure, protection and revenge

Three motivating factors can push a child to act out violently: exposure, protection or revenge, Brown said.

Children regularly exposed to violence inside their home or neighborhood can exhibit the same behaviors.

“They develop it as a way to cope and as a way to respond to stress,” Brown said. “They’re kind of responding to a violent environment by modeling that behavior.”

These children also may act violently to attain status, either in the community or school. That could be because their friends — and sometimes their parents — expect the students to be strong and tough, and the students perceive they are able to do that by having a gun, Brown said.

A Nashville student who posted a Snapchat video of himself with a handgun at Maplewood High School in March 2016 told police the Ruger SR9c’s safety was always off “so it’s ready.”

Students seeking protection are the opposite. Brown said these children are also often exposed to violence, but they may carry a gun to fend off additional trauma.

“They tend to be more on guard and on the lookout for threats. That’s the way they survive this world,” Brown said.

This group includes students who are bullied, teased or may feel like a misfit. But it also includes students who engage in potentially dangerous activity: Brown said students who deal drugs or are gang members regularly carry weapons.

A student carrying a gun to a Jackson middle school in January 2010 told other students he had to carry a silver revolver “so people would not mess with him or his family, and he was tired of him and his family getting threatened,” according to a police report.

The smallest group of children who act out violently are those seeking revenge. Brown said these students may have perceived a threat or slight against themselves or a family member. Instead of acting impulsively, like other children who carry guns, these students plan their revenge and target specific people.

“The saddest kids, they want other people to know they have a gun. Kids aren’t really that great about keeping secrets,” Brown said.

“If someone really wants to do a mass shooting, those are the ones who don’t tell anyone. The status kids, they’re going to want their peers to know.”

Beyond students, adults also bring guns to schools.

On a Thursday night in October 2006, police approached a group of people outside the Melrose High School football field in Memphis. Police arrested a 37-year-old man after an officer said he saw the man fighting with someone else. The man had a .357 revolver in a holster on his waist.

Police checked the gun and realized it should still have been in a police evidence room.

On the other side of the state in 2007, police in Dandridge arrested a 49-year-old man outside Jefferson County High School. He told police he was watching his daughter play in a band competition. Police said he “looked suspicious” and asked him if he had anything in his car. The man told him he had a handgun in his glove box.

Tennessee tries to make schools safer

After 17 students and teachers were fatally shot in February at a high school in Parkland, Florida, Tennessee Gov. Bill Haslam called for a statewide safety assessment of all school facilities and promised millions of dollars to pay for improvements.

On Sept. 25, Haslam and Tennessee Education Commissioner Candice McQueen said all 147 school districts in the state completed their review. The state awarded a total of $25 million in one-time funds and $10 million in recurring money to help pay for safety improvements.

Those improvements include “enhanced door locks, improved visitor screening procedures and shatter-resistant glass,” according to a news release. Some districts used the money to pay for school counselors and child psychologists.

The safety review resulted in districts hiring an additional 213 school resource officers — law enforcement stationed within schools.

Students have carried out shootings at schools across the country where officers and safety enhancement features were present.

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There’s no one reason a student, teacher or parent decides to bring a gun to school. But one Nashville expert explained the rationale behind leaving that weapon in a backpack or locker instead of opening fire is complicated and unpredictable.

“A lot of these kids have had very little control over the bad things that have happened in their lives,” Brown said.

“They have control over bringing a gun. It’s the one thing they can control in their lives. And if they had bad things that happened to them that they couldn’t control, or protect themselves from or others from, they may go overboard.”

There are possible 'red flags'

No one factor will cause a student to bring a gun to school or otherwise act out violently. But Brown said there are some obvious warning signs that should stand out to parents and teachers.

“If you notice any significant changes in their appearance or behavior, so if the kids stop taking care of themselves, not dressing like they used to dress, seeming more isolated, more withdrawn. … Those are at least red flags,” Brown said.

A young person may discuss violent fantasies or hurting themselves, have trouble getting over a fight or perceived slight or start using drugs. Any combination of these factors could be a sign the young person needs to speak with a counselor or other mental health professional.

Brown stressed there is no inherent connection between mental health and violence. She also knows about the stereotypes that teens are always moody, aggressive or distant. But as communities continue to cope with mass shootings at their schools, she said it’s hard to be overly cautious.

“Yes, there are normative phases of development, but it’s not normal to threaten to kill anyone or yourself, and that should always be taken seriously,” Brown said.

Reporter Jordyn Pair contributed to this report.