i.d. castro. >> did that work? >> we tried every piece of dinner ware but were unsuccessful. >> reporter: he is still a mystery man. >> that's right. >> he tried another fingerprint ploy. he took some glossy photos, walked up to castro's home, and he cooked up a story about burglaries in the neighborhood. could lou recognize the cars or people in the photos. >> so you hand the glossy 8x10s to the guy who you believe is lou castro. >> i do. >> how did he handle them. >> he takes them and holds them between his palms. once the photos are out of of the envelope he moves them with his fingernails and doesn't pick them up by his fingers. >> reporter: he knew exactly what you were doing? >> he did. >> reporter: he wasn't going to fall for it? >> no. >> reporter: what did you think of your nemesis here? >> raised my suspicion he was hiding from law enforcement. >> reporter: he called a