>> it was a message from chris. the cops might come back to your house. i need you to tell them that annie got a bloody nose so i don't get blamed. >> he told me about the -- he said something about the bloody nose. that i actually don't remember seeing. i remember hearing it though. >> lab results eventually did show annie's blood was on chris's shoes. detectives questioned him about it during a second interview. >> okay. it would have just been one drop? >> yeah. >> but then his story began to change. >> where did it drip on your shoe? >> there was a little bit on the shoelace and then there was a little bit right here. >> okay. so those are two separate drops you could see? >> yeah. >> in fact, the lab found more than just those two spots of blood. they found several. but studying the case file, jaclyn noticed that the lab didn't test every spot to see if it belonged to annie. they also hadn't tested the bottom of chris' shoes. so what do you do? >> well, at that point we went with a private lab to see if