>> nothing to be mad about. it's still a hit. you've still got illegal ammunition. >> in order to nab the target red-handed, they'll need help from an inside source again. >> it's going to be real hard unless we can get somebody else to work. wouldn't want to use the same guy. try to get somebody new. try to find somebody new in the area. >> protecting confidential sources is just part of the job for any investigator, but there are limits. their lead informant roosevelt lands right back where he started. the chicago p.d. and fbi busted him as part of their sweep. he faces various drug-related charges. >> i'm caught up in something i never did. i'm just one of the chosen ones. >> being on the block is that