the killer according to this report is his hand. the vein patterns on the hand in both images were a match. we asked a respected criminologist about that. >> together with the fact that mohammed has confessed, i think together that appoints everybody in the right direction. whether or not this will be admissible in the courtroom is a question. >> lawrence says that's because vein matching hasn't been fully validated as an investigative tool. the new report from the center of public integrity says a man named omar shake was wrongly convicted of killing pearl, though he did allegedly set up the kidnapping. it says mohammed was asked by a top operative to get involved because the kidnapers didn't know what to do with pearl. >> at one point this could have gone a different direction, right? >> what we diz covered is that omar shake had the original ransom note that danny would be released. and so the case turned.