Unforeseen consequences. First the nightline 5. When you dont get enough sleep and your body aches, youre not yourself. Tylenol p. M. Relieves pain and helps you fall fast asleep and stay asleep. We give you a better night. Youre a better you all day. Tylenol. And number one in just 60 good evening. Tonight we take you to the front lines of what is now one of the most dangerous and controversial jobs in america, police work. Law enforcement has become the focus of an Intense National conversation after the Fatal Police Shootings of black men in louisiana and minnesota, then the murder of five officers in dallas. My nightline coanchor juju chang gets a streetlevel vuitton night in this the first installment of our special week 95 long series in america in black and white. 1607, 1654 1110. Seems like, you know, in the current climate you have to be more vigilant. Yes, with everything going on, you have to be more vigilant. We always have to stay alert. Reporter officer Mark Blackwell knows the streets of bridgeport, connecticut, well. He grew up not far from here in a family of cops. But in the wake of the dallas ambush, this week feels different. Do you ever think its open season on cops . Feels like a bulls eye on our backs right now. We all want to be able to go home to our loved ones. Reporter his newest loved one, his 6weekold daughter. It was nine years ago this day that the 44yearold blackwell first donned his blue uniform and the badge. A badge now shrouded in mourning for blue lives lost in dallas as protests for black lives spotlight a painful racial divide. Oh my god, please dont tell me hes dead. Reporter after the controversial shooting of two black men by police officers, we decided to go out on patrol with blackwell and joey agosto, two cops uniquely positioned to bridge the gap. After the deaths of alton sterling and Philando Castille at the hands of police, intensifying the anger towards law enforcement. Now a rallying cry for nationwide protests. Starting out peacefully but ending in arrest after arrest. At least 42 in new york. 19 in chicago. 102 in st. Paul. One of the most Prominent National leaders of black lives matter, deray mckesson, among the 125 arrested in baton rouge. Why is he being arrested right now . Reporter periscoping his arrest live. In st. Paul alone, 21 officers were injured by rocks and bottles thrown by protesters. One officers teeth knocked out. Some condemning the entire protest movement. This is quickly becoming a terrorist group committing hate crimes. Reporter the New York Post categorizing the conflict with two provocative words civil war. Hates not going to get you anywhere. Its just fueling the fire. Everything is cops or pigs, cops are this, all they want to do is kill people. Its not like that. Reporter for officer blackwell, his shifts rarely involve violent confrontation. Hes never fired his gun in the line of duty. When things start to get tense they rely on critical training to defuse conflict, the best weapon for police to avoid using force. Blackwell responds to a nuisance call. An allegedly drunk man banging on a door trying to get into an apartment that isnt his. Officer blackwell and augusto keep the suspect calm, convincing him to walk away, bloodied, into an ambulance. Crisis averted. Blackwell and augusto believe in community policing. Trying to erase the perceived battle lines between people of color and the police. They were born here, raised here, theyre part of the community. Reporter this isnt just friendly chitchat, to them this is Quality Police work. Does it help that youre black . In some cases. In dealing with the public i could sometimes deescalate a situation. Reporter so much of their police work is a strategic effort to stay connected to the community. Today they shoot hoops with neighborhood kids, teenagers who tell us theyve already had those tough conversations with their parents. Do they tell you how to act around the police . They say to listen. They say you stop, you stop. Dont run. Do you feel the cops or good guys or bad guys . Some cops choose to use the law for what they want to do. When you see teenage boys what do you think . Even if they do something bad, i try to turn it to something positive with them. You have to do a threat assessment . Correct. Depending on the situation, our safety always comes first. Reporter bridgeport, like so many urban areas, facing its own painful questions about police brutality. This video from 2011 launched an fbi investigation. That mans lawsuit settling out of court with bridgeport police. The two officers pled guilty and were sentenced to prison. Reporter by sunday morning, reverend Anthony Bennett of a Historic Black Church across town is hearing calls to postpone their march on the local police headquarters. We are tired, brothers and sisters, of explaining to white folks and even some of our own people that being problack is not being antiwhite. Reporter hundreds gather to the steady sounds of drumbeats. Refusing to let one tragedy eclipse another. I personally, i think that everyone should be getting the message. Its not that were disregarding any other lives, anything like that. We just need to focus more on the black lives because were the ones being affected the most. Do you worry black lives matters gets hijacked by a sniper in dallas . No. No more than what dylann roof did indicts all white male christians in this country. Reporter along the march an army of cell phones. Many live streaming. We out here, hello. Reporter cell phones now ubiquitous, documenting the deaths of alton sterling and Philando Castille, whose girlfriend live streamed the moments just after he was shot by police. You told him to get his i. D. , his drivers license. Oh my god. Please dont tell me hes dead. Reporter these graphic images creating a groundswell of public sympathy for black lives matter. But the backlash is something officer augusto and his brothers in blue must contend with. People are like pretty much in your face with that, that camera. Were like, can you step back, give us some room . They dont want to move. Were judged on a splitsecond decision where the public, the media, they can analyze that, that same video, for hours. These are not just splitsecond decisions, these are life and death decisions. Life and death, life and death. Nobody wakes up to say, im going to come to work today and i want to kill somebody. Integrity reporter and yet we find common ground. Should we have education and mentorship for our young people so they dont end up living a life with Police Engagement . Reporter shared frustration over the rampart violence and needless loss of life. This is from the mass shooting . We had a shooting up here, people got shot, including a fatality. Black on black crime is out of control. Theres a lot of people in this community that want to address that issue. They dont want to see their loved ones killed. Reporter it may not have made National Headlines but the killing left its mark on this community and these officers, who say that above all they took the oath to serve and protect in order to prevent heartache like this from happening. Seems to me every day you go out on the job, youre putting your lives on the line. I love what i do. You love what you do . Yeah, im scared. You have to be scared when you do this job. But its what we do to protect other people. Reporter in the twilight hours of our ride with officer blackwell, he takes us to a place he describes as one of the most dangerous housing projects in bridgeport where shootings are commonplace. Im going to be a cop when i grow up reporter instead of blood we find hope. What are you going to be . A cop. You want to be a cop when you grow up . Me too. You too . Me too. Reporter hope that these young boys will never have to choose sides in a country seemingly divided between black and blue. For nightline im juju chang in bridgeport, connecticut. Next, one on one with a young woman theyre calling the best gymnast in the world. Her extraordinary skill, her signature move, and her moving personal story. Later, how a brandnew app already has more Android Users than tinder. Why pokemon go has police in some areas concerned. Doubts go. I was a smoker. Hands down, it was, thats who i was. After one week of chantix, i knew i could quit. 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She flips backward with a straight body two times. On the second flip she does a halfturn and lands forward. Reporter yesterday she took one more step toward the one thing she hasnt yet achieved. An olympic medal. Qualifying for the u. S. Team going to rio. Sometimes i hear the crowd cheering and most of the time like your bodys on auto pilot. So sometimes even after i do a floor routine, im like, did i really just do that . Reporter 2012, simone was too young to compete in the london games. Since then shes been on fire. The 19yearold gymnast is a threetime world allaround champion, the first woman to win the title three times in a row. Shes earned 14 medals in the world championships, 10 of which are gold. We sat down with her before the u. S. Olympic team trials to find out what it takes to make gymnastics history. You know how many hours a week you work . 32 hours. On mondays and wednesdays i train 12 30 to 5 30. Tuesday, thursday, friday, i train 9 00 to 12 00. Then 3 00 to 6 00. Then saturday we practice 9 00 to 1 00. Reporter time spent earning wins and the admiration of legendary coaches. Today, shes the best gymnast ever. Reporter bela karolyi says simone compares to the very best in olympics gymnastics history. Back at that time it was considered perfection, absolute perfection. Mary lou in her time was considered one of the wonder childs of the sport of gymnastics. Now simones time is coming up. Reporter mom nelly biles says simone was a Little Spring from the time she was a girl. Always jumping. Always flipping. I dont think simone ever walked up the stairs. Reporter discovering gymnastics was an accident that happened when a field trip was canceled. They did an indoor trip instead and ended up going to bannons gymnastics. And i still recall simone coming home with a note saying, would we consider her joining the gym . Reporter simones biological grandparents adopted her from foster care at age 5. With their unwavering support simone sprouted. Always travel to me meets and do whatever i need. Im really grateful for that. Whenever i go out and compete theyre so excited when i do well. They know how hard ive put in. Reporter her coach remembers when she saw her for the very first time at age 6. I was like, what is with this kid . She did a roundoff backhand spring. Her very first time in class. And she said, my brother taught it to me in the backyard. So it didnt take long before we pulled her to have her evaluated for team. Reporter its those handsprings perfected that sets her apart, says her coach. Knowing exactly where you are in the area. Some people have incredible balance . Imagine having balance without your feet on the ground, while flipping and twisting, knowing exactly when you have to bring your feet to the floor so you dont die. Reporter not dying was what was on my mind when i tried a small fraction of what simone does every day. Whoa. If he splits the beam hell hurt himself. Is split a beam what i think it is . Yes. Reporter that smile and those medals have caught the attention of corporate sponsors. Household names like tide pods. Its small but mighty. I paired up with them because it reflects on my gymnastics. Im very small but i like to say im powerful. I think it went hand in hand. Reporter before the commercials and the fame, there was sacrifice. All those countless hours in the gym forced her to miss out on moments most teenagers cherish. Since i was homeschooled those years so that i could do what i do, i thought that like i was missing out on like public school, going to all the football games, prom, homecoming. But then once i think back to it im like, well, yeah, i can say ive missed prom but ive been to three world championships. They wont ever get to say that. So i think its a winwin. I know it was tough for her because she saw her friends that she grew up with going to prom and home coming and all that stuff. She didnt get to participate in any of that. I know it was a struggle. Split and wrap, good. Shes a major rock star. When you have people like Mary Lou Retton and alec kroelly saying shes probably the greatest gymnast theyve seen in their lives, thats a really big deal. Reporter but that also creates really big expectations. Simone is the favorite to win gold in five the six olympic events. I guess whats on the line for her is it would solidify her as the best ever. Reporter she needs just three medals in rio to welcome the mostdecorated american gymnast of alltime. What would you feel when you standing up on the podium, you hear the starspangled banner . Thats a very emotional time. You feel everything, all your hard work put into that one moment. Then especially with the team you all get to share that memory together. Its something you can remember forever. Reporter for nightline, philip menna in hughes houston. The pokemon app getting so popular so fast, it may be putting some users in danger. Viagra single packs. So guys with ed can. 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Using the gps and camera in your phone it lets you see and catch pokemon everywhere you go. Over the weekend pokemongo trending online. Gaming gurus getting in on the fun. I found one reporter nintendo stock price soaring adding 9 billion in one week. Outside of central park, looks like it is filled with pokemons. Of course i had to give it my own test run. Where is he . There you go. Even making some new friends along the way. This is what ive caught so far. Its pretty good. Those are like rare, i think. Rare . I got three of them. Reporter the pokemon go craze hasnt been all fun and games. In wyoming one user happened upon a dead body while playing. In missouri Authorities SayArmed Robbers used the apps location feature to target victims. In a joint statement emailed to abc news, the Pokemon Company commenting on the safety concerns surrounding the app writing, we are aware that some incidents have occurred involving fans playing pokemon go. We encourage all people playing pokemon go to be aware of their surroundings. Which is exactly what i plan to do. For nightline, im Rebecca Jarvis trying to catch them all in new york