>> barry scheck is one heck of an attorney. rying to convince the jury not only were investigators incompetent, but they tried to frame o.j. for the murders. and juror david aldana agrees. do you truly believe evidence was planted? >> yes. from this day until the day i die. i think it was planned. >> if this was a conspiracy, how do you get blood on socks, blood on the bronco, his own blood? >> it's laughable. let's look at planting the blood, how do we get that blood from simpson, who is in chicago, to plant blood that's already at the scene? it made no sense. obviously it made no sense. we didn't get simpson's blood until he returned from chicago. none of it made any sense, but nobody cared. it was a great show. >> and the show continues. more testimony from defense experts. >> have you ever seen a single assailant wear two pairs of shoes? >> no. >> that represents human dna that shouldn't be there and that's what our definition of contamination is. >> on the stand now, o.j.'s personal physician, robert huizenga. he testifies