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arrested and then released in a matter of hours. happens all the time. i'm bill hemmer live in new york city. dana has the day off. welcome back, j.b. >> julie: i'm julie banderas and this is "america's newsroom." the assault was caught on video. this happened over the weekend in harlem. police say the teen jumped a subway turnstile without paying when officers confronted him and things turned very violent very fast. >> bill: street fight. you can see the suspect hitting the cop. the teen puts the officer in a choke hold when a second officer steps in to try and help. >> julie: why d...

>> julie: wow. what do you feel is most frustrating for you when you look at all these cold cases, murder cases all over the country, families especially who have never been able to get answers and that's the hardest part. what us from trace you most about the technology used in the past and could it have been any better? >> well technology has really advanced and there is no way people could have predicted what we would be able to do today. so we owe the original crime scene investigators a huge debt of gratitude for collecting that biological evidence that allows us to do this. to me -- go a...