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Wire, and your reaction to these sort of things? >> governor abbott has done a fantastic job of keeping everything in the light and we're trying to do things when other people are ignoring the problem or saying a problem doesn't exit. you've got a lot of naysayers and say they're not going to stop it. it's not just so much about stopping, but deterring some of the traffic, allowing law enforcement to get into those areas and apprehend the individuals still trying to come across. it's many things, deterrents, timing, and deport certain resources in the right direction because as we know, the ad...

>> it felt like we were being stung by bees. >> reporter: that shooting changed policy prompting the police departments to upgrade their own weaponry to counter the powerful guns being used by assailants. researchers simulate a bullet's impact on the home body. >> it is a block of gelatin meant to replicate human soft tis tissues. >> reporter: watch. >> for this round you will see the bullet coming in on this side. you see this temporary cavity here happening. that expansion happens in the body. then it chapollapses down. >> reporter: now a team fires a round from an assault rifle. >> more dis...

>> it is a block of 23% gelatin and it is meant to represent the human tissues. is soft tissues. >> reporter: watch as the team hires a handgun round at 1,000 feet per second into the gel pin block. >> you see it come in on this side, you see the temporary cavity happening, that expansion is what happens in the body and then it collapses down. so that is where your damage comes. >> reporter: now watch as a team fires a round from an assault rifle. >> we see a lot more disruption, this round actually breaks apart, it doesn't exit so it is about 3,000 feet per second and all of that energy goes ...

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 wh...