Botham Jean's mother, Atatiana Jefferson's sister discuss police violence: Part 2

Jean's mother, Allison Jean, told Amber Carr, Jefferson's sister, that Jefferson's death impacted her "very strongly." A program in Maryland helps police officers train for high-stress scenarios.
8:46 | 12/21/19

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Transcript for Botham Jean's mother, Atatiana Jefferson's sister discuss police violence: Part 2
A dark night in ft. Worth, Texas. You're watching police body cam footage. Inside her home, Tatiana Jefferson has no idea her date with death is imminent. Put your hands up, show me your hands! Reporter: The ft. Worth police department, the chief came out almost immediately and condemned what happened. Nobody looked at that video and said there's any doubt that this officer acted inappropriately. Reporter: How significant is that? It's huge, but when are we going to look at the system itself and look at American policing and say what can we do differently? Reporter: So we went in search of answers and headed here to the Maryland eastern shore where we were given exclusive access to close quarters defense. Once mostly reserved for U.S. Special ops and federal agents. They have no idea what they're going into. Which is valuable, because we want them to do exactly what they would do on the street. Reporter: Dwayne Deeter is the founder, expert in hand to hand combat and weapons training. Today a group of police officers and sheriff's deputies will be We all love you. It's about making you better. So all those trainees come with me. Reporter: His program is all about subjects cops rarely share with the public or their families. Stress and fear. Stress not controlled can make a person be aggressive to someone that's not necessary to be aggressive to. Reporter: Jackie Dalton, 36, a U.S. Coast guard veteran, now a rookie cop in Maryland, fresh out of the academy. I acorps my co-workers and my I don't want to let them down. Reporter: One of the key tools in Dwayne's training, this simple cloth and rope called the hood. Each time the hood comes up, the trainee encounters a new scenario. Inches away could be a gunman or pedestrian asking directions. So the hood teaches students to do what? To be able to react quickly. An ability to be aggressive, assertive or passive. Compassionate. All has to be within split seconds as it applies. Reporter: Dalton suits up. I'm going to lead you in right here like this. There's noise to help build the stressors. Reporter: So, in this, you Yes, we need it. Reporter: Stress is their friend. It will become their friend. At first, it is not their friend normally. Reporter: Deeter observes her. She's verbalizing. De-escalating. Reporter: Given a baseline on how she performs under stress before his training. Get back, get back, get back! She's getting her gun, which is very common. That would be a bad situation that happened. Her energy was high enough that she eventually shot the person. Reporter: Even though the person was moving away from her. Exactly. Was not a threat. Reporter: Though he attacked her initially, he moved back. So that's where we do not shoot. He's no longer an active threat. You can relax, just relax. Please just describe why you shot that person and used lethal I used lethal threat because I felt fear for my life and they could have threatened either the person off to my left or myself or any other citizens if I let them get away. Did you see that he had any weapon or not, the person off to your right? He had a gun. And did he shoot at you from that position? Or what did you see? He was aiming it towards me. He did not shoot. Reporter: What she thought wasn't reality. And not even close. She actually saw a gun. Reporter: Many of us were raised to believe that the truth is always the truth. But what we saw today under stress, the truth can look different. Their perceived truth, that's right, it's because they are not used to this level of stress, so their truth is very different sometimes than what truthfully and they will say what they believe right off the bat, because that's what they saw. Reporter: Deeter says Dalton isn't the only student perceiving things differently He was taking my gun, he actually had it. Reporter: Sharing these videos with us of others on day one. Can you train that out of a person? Absolutely. We do it every single time. You did good. Reporter: Dalton is drained, distraught, yet she shot an unarmed man. All right, you did great, you did great. Have you ever felt that before? No. And a little bit of training, this will be a comfortable thing for you. You'll feel it. You'll feel you have the energy to respond to it and react to have a seat, relax. All right, thanks. Reporter: What do you think? It's stressful. It's emotionally draining. Reporter: My sense from him is you did a hell of a job. I appreciate that, but sometimes it's not enough. Reporter: You're shaking. It's an important job. And I feel a lot of pride in doing what I do. Get down on one knee! Reporter: Deeter's program can take weeks. But even after just one day of training. She did better. She did better. Reporter: We witnessed a transformation in Dalton. Get down, get down! Now to the person was complying and went for the gun, she was able to pick it up. Reporter: She aced it. Controlling stress, dietzer says, actually improves decision making. You're smiling this time. Yeah, I'm smiling this time. It was, it felt less stressful, even though I was still going through sort of the same thing. I was able to focus a little better. Reporter: What I saw from you this time is confidence. Right. Reporter: Deeter's training program costs $350 per officer per day. And stop, that's good. It helps them to adjust to what is in fact going on around that's not something that you get in the basic police academy. It's just not. Reporter: Budget challenges, however, face every police chief in the country. Chief Walters' department has help from a private benefactor. Great work. Great having you, super job. Super job. Be safe everybody. Reporter: Be safe at the end of every shift, that's the goal of law enforcement and those they serve. For Alison Jean whose families like hers there is no training, only the tender teacher heartache provides, wisdom Jean is about to share with amber Karr, still in the early stages of despair over her sister's death. Hello. How are you? I'm good. How are you? Good, how you? So good to see you. You too. Such a terrible thing. I really wanted to reach out to you, reach out to your family. Let you know that we are with you. Thank you. We are. Thank you. Tatiana's death impacted my, very, very, very, very strongly. Because it seemed so muchle like what botham went through. It's so terrible. I know, right? But we have to continue. To live. Yeah. What keeps me going, too, is the energy which botham had. I just know that he would not want me to -- Give up. Give up. You say you're tired. I used to say that, too. Because you're wrapped up in grief, but at the same time, you're fighting for justice. Mm-hm. You have to try to build strength. Reporter: But casualties and cost of policing in America are high. The stress and sacrifice real. A split second. Where life is lost. Lives are changed. Forever. Still fresh...

This transcript has been automatically generated and may not be 100% accurate.

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