three half brothers that have been exonerated and numerous others whose cases were connected to lewis scarsela joins us. when did you determine that there may be problems with detective scarsela's cases? >> it goes back a couple of years. my office vetted problem areas -- investigated problem areas throughout the city of new york, involving troubled presincts and patterns of police, behaviour and difficult detective buros. >> why do you think scars targetsome of the men. >> many of the defendants or suspects that are targeted tend to be from poor areas, tend to be people of colour, and tend to be from inner city areas where crime rates at particular time are higher than others. these cases where we deal with detective scars date back to the late 80s, and early '90s, when new york city had a record murder rate and a difficult crime rate to deal with. >> how is robert hill doing since his release? >> robert hill is doing well for someone who is afflicted with multiple sclerosis and spent the last 25 years having to deal with that illness without proper treatment. >> do you see this as a victory

. >>> detective lewis scarsela was legendary at the time. known for making arrests and getting convictions. in 1995, the year moses was charged with murder the -- charged with murder the city's crime rate took a nose dive, attributed to aggressive policing. the murder of the 4-year-old girl outraged the community, and sunday moses was the suspect. >> at that point my mind went into survival mode. >> reporter: did you feel your life was in danger? >> yes, i did. at that point they weren't acting like detectives. they were acting like a gang. and i'm saying that they wouldn't accept anything outside of a confession, and now that i'm realising that, so that, with not knowing the law, of course, i said, well i'll tell them what they want to hear, and i can prove that that was a lie. >> detectives wrote up a confession for moses with their version of event. to pit an end to their problem put an end to their nightmare, moses signed it. >> reporter: why in the world would you confess to a crime you didn't do, a murder no less? >> i never thought i