do you feel safe at school? why not? because of what happened. reporter: the searing words of maya cirillo. he shot my friend that was next to me, and i thought he was going to come back to the room, so i put a little blood all over me. reporter: the haunting pain from the voices of kimberly and felix rubio. i can still see her walking with us toward the exit. the reel that keeps scrolling across my memories, she turns her head to acknowledge my promise, and then we left. i left my daughter in that school, and that decision will haunt me for the rest of my life. reporter: or this detail from the doctor. two children whose body has been pulverized, decapitated, flesh ripped apart.
asphalt, radiator fluid. reporter: that shooting changed policy, prompting the lapd and other departments to upgrade their own weaponry to counter the guns used by assailants. that firepower from weapons is studied inside a ballistics lab in wayne state university, where researchers simulate a bullet s impact on the human body. it s a block of 20% gelatin, meant to represent soft tissue. reporter: watch as they fire a hand gun round into the gel tin block. for this round, you ll see the bullet come in on this side, you ll see this temporary cavity happening. so that expansion is what happens in the body and then it collapses down. so that s where your damage comes in. reporter: now watch as they require a round from an assault rifle. we see a lot more disruption. this round breaks apart, it doesn t exit. so it s about 3,000 feet per second, and all of that energy goes into the soft tissue. we have a piece of plastic here
to do the videos, and it lifted the plastic off the table. reporter: the hand gun round shows a straight line, exiting the other side. but not so with the round from an ar-15. it goes into the body and creates an explosion inside the body. reporter: trauma surgeons say the wounds can be catastrophic. the worst part, in a child, all the vital organs are that much closer together. so each bullet causes irreversible damage. reporter: in uvalde, texas, families were asked for dna swabs. as a mom, it really affects me because i cannot imagine having a child endure this. reporter: with high capacity magazines, suspects can shoot for much longer. the discussion about high capacity magazines reduces the amount of time a suspect can fire without reloading. as a former fbi agent, we were
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quickly trained to get your weapon reloaded. but for a suspect who isn t trained, that is a process. it involves removing the empty magazine, obtaining a fresh round of ammunition, loading it into the weapon, charging the weapon, getting it back up on target. those are all precious seconds where victims can be fleeing, the gun can jam, or the suspect could be engaged by law enforcement or bystanders. knowing the damage that sustained firepower can do, researchers hope their critical findings lead to awareness. regardless of where one comes down on the gun control debate, it s indisputable that the assault weapon causes significant damage to a body. definitely. this is the reality. this is what s happening. reporter: erin, we often hear these rifles described as weapons of war. that s because that was the original intent. the u.s. military required a weapon that was lightweight with a high kill rate. by the vietnam rate, it was standard issue.