>> so you -- you -- you're completely confident your d.n.a. is not in that house anywhere? >> i know it's not. i know it's not. >> he -- he keeps saying, you know, "i -- i didn't do anything so i don't have anything to worry about." >> reporter: but was he in fact on your list at that point? >> oh, he -- he was, you know. he was, he put himself with michael. >> well, i think you know a little bit more than you're telling me. >> sir, i don't. i -- i -- i've -- i'm giving you pearls, man. i'm giving you all i got. i -- i've told you guys everything i know. i know that he came over. i know exactly when he left. i know i was at my house. that's all i know. >> reporter: for all his questions, investigator edmunds ultimately had nothing on anthony. a failed polygraph isn't evidence, and nothing connected him to the crime. but they were still looking at michael, and there was the inevitable question of motive. sure, michael was open about his drug use, but that didn't entirely explain why he would savagely beat his mom's best friend. >> my bookkeeper came to me and said "we've got some issues here."