>> my brother's murder will not be in vain. his selfless legacy will live on. >> reporter: and in some ways, it already has. this week a family friend shared a photograph of officer smith's daughter giving a bracelet she made to the daughter of fallen police officer zamarripa. the funerals for officer zamarripa and officer michael krol are set to happen within the next few days. >> the murders of those dallas officers was motivated in part by the fatal police shooting of alton sterling in baton rouge. well, today the american civil liberties union sued the police there over their treatment of protesters. sterling's 15-year-old son cameron urged marchers to protest the right way. >> i'll never forget that image of you wailing on the side of your mom. >> when i put my arm around her it's like somebody else's hand touched me. like i had another hand laying on top of my hand. and when i looked over, wasn't nobody else touching me. nobody else was touching me. and it was like at that moment i knew. my daddy here. he right here beside us. we're standing here as a family once again. i really want everyone to know, alton sterling was a good man, no matter what anyone else has to say about him. truly in my heart, i know he was a good dad. >> reporter: what is your opinion of police in general these days? >> all police aren't bad. they all aren't bad. there are some that are bad. but all aren't bad. how i feel, i feel all police shouldn't be punished for other police's crimes. the police in dallas, texas, they didn't deserve that. because you didn't, nobody knew if they had kids to go home to. those kids need their parents. >> reporter: people around the country have been protesting because of what happened to your dad, what would you say to them? >> continue protesting, but what i want, what i ask if you truly love my father. i want everyone to protest the right way. protesting in peace. not in violence. not beating the police, not police beating the people. that makes no sense. that make things worse. you have to make things better by making peace. >> reporter: today cameron got on a plane for washington. tomorrow it's expected he'll meet the president, and on friday, he will return to baton rouge to bury his dad. >> david begno reporting for us. 47 american troops have been rushed into south sudan to protect americans and the u.s. embassy. it was five years ago that the u.s. brokered a deal that created the world's newest nation, splitting it from the rest of sudan. but civil war between rival ethnic groups flared again this week. the u.n. says more than 4 million south sudanese are threatened by famine. coming up, a manhunt for a ♪ what are you doing? sara, i love you, and... 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the youngest victim. his daughter stephanie and her daughter were also gunned down. this is not a sniper shooting someone at a distance. >> right. >> reporter: they look their victims in the eyes. >> not even a drive by. walked up, made sure someone was in the car and just opened fire. >> reporter: phoenix police have now linked those murders to four others and the fbi and u.s. marshals have joined the investigation. the shootings began in march. since then, the serial killer or killers have murdered seven people within 50 square miles. all of the shootings occurred outside homes and at night. >> right now, we have not determined a motive in any of these incidents. we haven't found a relationship between the victims. >> reporter: investigators have a sketch of the suspect. and the community, while on edge, is being vigilant. mark upchurch is with the guardian angels. >> i know if he's not caught he'll kill again. >> reporter: but for he and his wife sylvia, it's already too late. >> they've taken my world. my life. my daughter was my life. >> reporter: now phoenix police were just investigating another apparent shooting that happened just a couple hours ago. neighbors were hoping it might provide new leads in the serial shooting case, but it appears at least right now it's not related. >> carter evans in phoenix. coming up, one by one, they were taken down by a powerful drug that is sweeping the nation. yesterday more than 30 people in new york suffered bizarre reactions to an illegal synthetic drug which is now available all across the country. michelle miller reports from new york city. >> can't stand up straight. >> reporter: it was a bizarre scene, dozens of people with blank stares, stumbling around a brooklyn neighborhood yesterday. brian arthur live streamed it on facebook. >> as i'm walking up the block, i see everybody laying on the floor, and everybody's stumbling all over the place. it looked like a scene out of a zombie movie. >> reporter: emergency workers sent 30 people to hospitals saying they were under the influence of k-2 or spice. designed to mimic marijuana, it has far more powerful effects. this man says he's used it before. >> k-2 does, puts you in a delusional world, have your mind spinning, mind alterment. >> reporter: it's made by spraying various lael chemicals onto plants, ground up and smoked. many users experience confusion, hallucinations, rapid heart rate and even seizures. police say it's sold at small, neighborhood grocery stores. a cbs uncoverdercover investiga found it at this store. k2 is growing nationwide. more than 3500 calls of synthetic marijuana use to poison centers over a five-month period last year. drug dealers have managed to stay one step ahead of federal law enforcement. no sooner do they ban one recipe for k2 manufacturers come up with another, making it virtual lay impossible for the ingredients to be banned. up next, a teenager's poem up next, a teenager's poem is g,,,,,,,,,, we end tonight with a poem written and performed by an atlanta teenager this past spring, but it's been getting new attention from millions after the violence that shook america last week. here's mark straussman. >> my poem is titled "white boy privilege." >> reporter: it was an entry in a school poetry contest. >> i'm scared what it would be like if i wasn't on the top rung. if i didn't have my white boy safety blanket to protect me. >> reporter: it was a plea from a 14 year old white male going to private school in atlanta. let everyone share his privileges. >> i love it, because when i see a police officer, i see someone who's on my side. >> i'm just trying to be truthful about like how i wofbts trade places with somebody. and i think a lot of people sometimes aren't so truthful about that. >> reporter: racial division seared america last week, after minnesota, baton rouge and dallas, the poem vukstruck a ne. more than 8 million have seen it. >> everyone's story should be written so all they have to do is get it read! i get the change can be scary, but equality shouldn't be. >> i'm not asking anybody to give up their lives for equality. i have other dreams, too. i'm just asking you to try to be an outlet. do your share. when you see something that you think is wrong, that's discrimination, speak up. >> it's time to let go of that fear. it's time to take that ladder and turn it into a bridge. >> reporter: he also won that poetry contest. mark straussman, cbs news, atlanta. and that's the overnight news for this thursday. for some of you, the news continues. for others, check back a little later for the morning news and of course, cbs this morning. i'm scott pelley. this is the "cbs overnight news." welcome to the overnight news. i'm jericka duncan. donald trump spent another day interviewing prospective running mates and will release his vp pick tomorrow. he and his son-in-law were at the indiana governor's mansion having lunch with governor pence. he is on the short list that also reportedly includes chris christie and former house speaker newt gingrich. a new poll shows nearly two-thirds of americans think the choice of a running mate is either very or somewhat important to the presidential race. major garrett has more. >> reporter: donald trump summoned his family to meet at the governor's mansion, their second face-to-face encounter in two days. he then left for indianapolis to huddle with other potential running mates. first newt gingrich. he often tells trump he's leading a movement of historical significance. trump also met with four-term alabama senator jeff sessions, the first senator to back the candidate. and trump spoke by phone today with new jersey governor chris christie, whom he's known the longest and been the most outwardly loyal since ending his own campaign. christie chairs the trump transition. meanwhile, the devout evangelical christian has a deadline. he must notify the state by noon friday if he'll remain on the ballot as a candidate for governor. as for the meeting with trump -- >> nothing was offered. nothing was accepted. but we had a great conversation with the country. >> reporter: do you think you could help him more as vice president or governor of indiana. >> that would be for others to say. i could just honestly tell you, these are good people. these are people who have the best interests of america at heart. >> donald trump gets it. >> reporter: the two campaigned together tuesday night, arriving more than an hour late after a fund raiser. trump appeared pleased. >> you'll be calling up mike pence. i don't know whether he's going to be your governor or your vice president. who the hell knows. >> reporter: throughout this campaign, trump has thrived on risk and gut instinct. pence is the more conventional choice, backed by trump's inner circle and some family advisers, but christie's personality is closer to trumps and few outside vi advisers have more clout than gingrich. the convention gets under way next week. ohio is an open carry state. and those attending protests will likely be armed. >> reporter: for one thing, there will be of course a large, hefty law enforcement presence in these barricades, across the street from the quicken loans arena. these barricades will soon be part of the security infrastructure here for crowd control once the convention begins. >> we're not going to restrict anybody's constitutional rights. >> reporter: calvin williams says his officers are prepared to deal with the possibility that many of the people on the streets during the gop convention could be armed. >> people in this state have a right to open carry. there's a second amendment and we understand that. our officers are prepared. they're used to seeing that in downtown cleveland for different events. >> reporter: the targeting of the police in dallas has put extra focus on open carry concerns and the confusion it might create if chaos erupts. it was something david brown addressed on monday. >> it's increasingly challenging when people have ar-15s slung over and the crowd begins running. we don't know who the good guy is versus who the bad guy is if everybody starts shooting. >> reporter: in june, a man in las vegas was arrested and accused of trying to kill the republican presumptive mom me aft -- nominee after trying to grab an officer's gun. another man was grabbed in dayton, ohio. >> there's no specific credible threat in relation to the rnc. >> reporter: joseph clancy insists his agency is prepared for the convention. >> we've been planning for close to a year. but the plan's never finished. you have to constantly be ready to adapt, be flexible to whatever may occur. >> reporter: they are expecting about 50,000 people to attend the convention. it is harder to put a number on how many people will be coming here armed. closer to the quicken loans arena, there is a zone where weapons are banned. but anywhere else, you can legally carry. for the democrats, they go into their convention united after bernie sanders threw his support behind hillary clinton. sanders sat down with charlie gale and nora to discuss the race ahead. >> you have made attacking wall street a pillar of your presidential campaign. are you capitulating some of your values by endorsing hillary clinton? >> no, i'm standing up for working families and the middle class saying donald trump would be a disaster for the future of this country. what this campaign is about is taking a hard look at which candidate is going to do more for ordinary americans. i think that choice is very, very clear. we have worked with secretary clinton's campaign. she is talking about making public universities and colleges tuition free-for-all families under $125,000. she's talking about expanding health care while donald trump wants to throw 20 million people off the health care they now have. donald trump does not accept science, thinks that climate change is a hoax. hillary clinton wants to rebuild our sustainable energy system and move away from fossil fuels. the differences between the two candidates are very, very clear. clinton is by far the superior candidate for the middle class to my mind. >> do you believe you have pulled her to the left? >> i think, when you get 13 million votes, which is what we got, when you win 22 states. when young people all over this country are demanding real change, secretary clinton and her team are smart enough to understand that they have got to go where the action is, and they have to move to where the people want to go. and what the people in this country want is a standing up to the big-money interests. >> okay, so -- >> what didn't you get? >> well, what we didn't get is me becoming president of the united states of america. [ laughter ] >> are you having running for president withdrawal already? >> i'm feeling fine, thanks. >> are you going to miss the secret service? >> that's an interesting question. yes and no. when i'm going to the bathroom.y that's the advantage. but those guys did a great job, and appreciate what they did. >> some things should be private. thank you. >> good luck with that. covergirl has big... ...news for lashes! the numbers are in billions of lashes have been blasted! wow, that's a lot of lashes! from up to 10x lash volume to soft, full lashes to volume and length try our award winning collection! millions of girls, millions of looks billions of beautiful lashes blasted! the lashblast collection from easy, breezy... ...beautiful covergirl and draw more attention to your eyes with... ...perfect point plus and pow-der brow introducing new k-y for massage and intimacy. every touch, gently intensified. a little touch is all it takes. k-y touch. breyrich chocolate sauce.ato, peanut butter cups. tonight is perfect. can someone read me another story? daddd? mmm coming breyers gelato indulgences it's way beyond ice cream. over the past 17 years, photographer danny clinch has shot just about every heavyweight in the music industry, rappers, rockers, country stars and pop artists, and clinch has made a lot of friends along the way. anderson cooper has his story for 60 minutes. >> reporter: bruce springsteen, hitting the road on tour once more. his wife patty by his side, and danny clifrpgs is there to talk about old times. >> in '89 was the first team i photographed you guys. >> reporter: and shoot the band rehearsing. >> one, two, three, four! ♪ >> reporter: over the years, clinch has taken thousands of pictures of springsteen. and many have become classics. >> it's a sweet little spot. >> reporter: they're portraits of the artist off stage that mirror the message and tone of his music. then there's the famous scene of springsteen falling from the stage into the crowd. did he know you got it? >> i felt like i did. yeah. >> reporter: clinch wears many hats. he covers the musical spectrum. tony bennett and lady gaga. >> i'm not a strong arm guy. i want to collaborate. >> reporter: country star miranda lambert. >> you want to make people relax. >> reporter: singer/songwriter sam smith. >> you want to find a common ground as quickly as you can. >> reporter: he goes way back with many musicians. that's trey anstas yoe. trusting him to stay out of the way. it's new year's eve. fish is playing madison square garden. and to the crowd, clinch is the invisible man. what is it about shooting a concert? what are you trying to get? >> i'm trying to capture a moment. it's not about the singer at the microphone. i'm trying to look for like a moment in between. >> reporter: he works from the back of the stage, hiding behind the drums or the amplifiers, waiting for that in-between moment, popping up like a whack a mole to get his shot. and sometimes over the years it's paid off big as in this classic photograph. the view from the stage of info fighters. or this one. airborne. >> i popped up from behind the amplifiers. >> reporter: you were hiding behind an amplifier. >> yeah. >> reporter: do you wear earplugs? >> i should. >> reporter: but you don't? >> i often don't. >> reporter: i'm surprise issed y you can hear me. >> what? i get out there and i'm like, geez, i should have some earplugs, i forgot them. >> reporter: he was an a sssistt to annie leibovitz. if your pictures aren't good enough, you're not close enough. and even when he's not working, he's looking for that perfect shot. >> i'm such a visual person. i don't want to miss that moment. >> reporter: you're rarely without your camera. >> rarely. >> reporter: even sitting right here. >> see, i always want to be prepared, because you never know who's going to come to your studio. i really like this one a lot. >> reporter: his studio is a place where any music fan would love to be locked up for a few days. >> it's like a history of rock 'n roll. >> reporter: a couple years back he photographed one of the men who started it all. chuck barry who's now 89, and jerry lee lewis who's 80. and here are pictures from that first session with bob dylan. >> we were trying to give him a little something to do and somebody came back with a bunch of different language newspapers. i started to shoot, keeping it real simple. >> reporter: more of his greatest hits. southern gothic. gregg allman. johnny cash waiting to go on stage, a shot capturing the loneliness of life on the road. country stars faith hill and tim mcgraw. tupac. >> he was really into it. he took his shirt off and i saw all the tattoos, and i said would you mind doing one like that? and he said yeah. >> reporter: when you took this, did you know how strong if was? >> i felt like this was a powerful image, that the simplicity of it was really powerful. >> reporter: clinch has branched out into videos and commercials. ♪ you give your hand to me >> willie doesn't mind my taking his photograph. i found ways to work with that. >> reporter: he also got some very candid stills. nelson braiding his hair. and indulging in his favorite recreational pastime, smoking a huge stick of weed. i don't know what we'd call this. >> i know. >> reporter: it's like a cigar. >> somehow i can't remember what happened after that. ♪ but you don't know me >> reporter: and then, there are the occasional shoots he wishes he could forget. >> i was at a madonna show, many, many years ago, and i was like in the sweet spot, and she came out, and she was like, it was the best part of the show. i was shooting, shooting, shooting, god, i must have shot 100 pictures. have i not run out of film? and i opened the back of my camera, and there was no film in there. >> oh, no. >> so that happened to me only once. >> reporter: ouch. ♪ >> reporter: no doubt one reason he gets along so well with musicians, he knows the language. wearing yet another hat to play with the tan jeers blues band, sometimes jamming with the likes of willie and bruce. his harmonica, like his camera, going everywhere he goes. ♪ >> reporter: he grew up on the jersey shore, living in tom's river, a few miles down the garden state parkway from springsteen country. >> these are some good ones. >> reporter: he got the photography bug from his mother. >> she always had a camera. always still has a camera. and at times i find myself taking pictures of her taking pictures of the family. >> reporter: and from his father he got a taste of classic rock 'n roll from the '50s and classic cars. his prized possession, a 1948 pontiac silver streak, the sort of car his father always noticed when clinch was a kid. >> everywhere we'd go, he's like, there's a '55 chevy. and i started to like cars myself. >> reporter: and he's always found a way to work helm into the shot. with clinch's father at the wheel. an old cadillac and young inside tooling around nashville. >> you can see the full report on hey there, heard the good news? 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>> it's 60% legs, 30% more give or take core. and about 10% arms. so it's really just the opposite of what you would think it is. >> the rhythm is there. long and strong. >> rowing and crew is no joke. >> reporter: jordan is a sports medicine physician. >> if you're doing a hard run or a hard row, you're probably burning about the same number of calories. the difference is, if your joints become arthritic, running can sometimes be painful. rowing is much less low force on your joints. >> what is this? >> reporter: even the netflix hit, "house of cards" can't resist the urge. the rhythmic sounds of frank underwood's machine provide both a sound track and interesting analogy. >> translator: serie and every time underwood takes a stroke, water rower, the company that makes his erg getting a bump in sales. the factory has tripled production to more than 1,000 machines a week. while there are plenty of people who prefer to go at it solo. frolik says whether you're on the water or dry land, the real benefits can only be had when you're rowing with a crew. >> rowing at its best is a large group of people breathing together. it almost becomes a med daytive, powerful ,,,,,,,,,,,,,, the fbi says there has only been one case of skyjacking in u.s. history that's never been solved. and now they're closing the case. you may not remember the story of d.b. cooper, but for decades, he was notorious. don dahler explains. >> reporter: he parachuted somewhere between seattle and reno, nevada in 1971 and disappeared with ransom money and was never seen again. did he get away with it? did he die trying? it's now safe to say wll probably never know. >> it was just time. >> reporter: with those words, frank montoya jr. ended the 45-year hunt for the hijacker known as d.b. cooper. >> i was 8 years old. i remember watching walter cronkite. it brought back a lot of memories to sight archival footage. >> when he got even the plane, he was just another passenger. >> reporter: an early report misidentify him as d.b. cooper. cooper bought a $20 ticket and boarded this boeing 727. he allegedly showed what he said was a suitcase bomb and forced the plane to land in seattle. 3 36 passengers were released. at cooper's orders, the plane took off for mexico city, apparently with the rear stairwell left open. somewhere between seattle and reno, cooper jumped out of the plane with the cash. >> how do you surmise that he was not on the plane when he landed in reno? >> well, a search was made of the plane immediately after landing. >> reporter: an exhaustive investigation began. in 1980, a boy digging near the columbia river found three bundles of weathered $20 bills, linked to the ransom money, but it only totaled about $6,000. the case has inspired films, books, and even a song by the birds called "bad full of money." >> be glad when it's over and ready to land ♪ ♪ with this bag full of money i've got in my hand ♪ >> reporter: over the years, the drmt b. cooper investigation has diverted resources from more pressing cases. >> this is the only unsolved skyjacking in american history. that's the overnight captioning funded by cbs it's thursday, july 14th, 2014. this is the "cbs morning news." after weeks of speculation donald trump is set to reveal his running mate. when he's announcing and who he spent last night with. ♪ amazing grace a final farewell in dallas. family members of the fallen officers remember the heroes and their final moments together. >> one thing i would always say to my dad as he walked out the door was