is? >> 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. >> said something about the bloody nose. that i actually don't remember seeing it. i remember hearing it, though. >> lab results did eventually show annie's blood was on chris' shoes. detectives questioned him about it during a second interview. >> would have just been that one drop? >> yeah. >> but then his story began to change. >> there was a little bit on the shoelace. there was a little bit right here. >> so two separate drops? >> yeah. >> in fact, the lab found more than just those two spots of blood. they found several. but studying the case file, jaclyn noticed the lab didn't test every spot to find out if it belonged to annie. they also hadn't tested the bottom of chris' shoes. >> so what did you do? >> at that point we went with a