hooded sweatshirt found feet from his body. >> if you look close, there's something on this particular cuff. then the question is, was it blood? did you test it? >> according to the crime lab report, no. >> they know something happened in that gym, and they don't want it to come out. >> for the johnsons, there's no stronger indicator than this photo. it's of what appears to be blood dripping down the wall. this is what stryde jones said. >> we tested it and it was blood. we did dna testing, it was not the blood of kendrick johnson. >> who's blood was it? >> did you ever find out whose it was or any involvement? >> as of now, no. it doesn't appear to be related to our crime in any way. >> what do you think of the decision not to test it further? >> you can't explain it. if you're running the crime scene, you're going to say, that potential evidence.