here's cnn's ryan young who sat down with three of those wrongly convicted. >> reporter: it may be a first in chicago, 15 men exonerated of their crimes on the same day. their felony drug convictions tossed four years after the officer's investigations were first called into question. >> these cases have been concluded. and unfortunately, the police are not being truthful. and we couldn't have confidence in the integrity of their reports and their testimony. and so, in good conscious, we could not see these convictions stand. >> reporter: leonard gibson said officer ronald watts framed him and took years away from his life. >> i went to jail for 2 years, 24 months. came back home and put another case on me. >> reporter: in 2013 watts then a chicago police sergeant was sentenced to 23 months in prison after pleading guilty to government funds. and then another officer stole