richard leo, a professor of criminology and psychology at the university of california at irvine, agrees this is an awful, awful interrogation. i think this is shoddy, poor police work, and i think these -- the detectives who conducted this interrogation should be retrained, and until they're retrained, should not be permitted to do another interrogation. >> during the first day of police interrogation, alvin denied he killed tinky. >> never. >> come on, alvin. what are you going to do? say something. explain it. >> what you saw was an incredible amount of intimidation. over 100 times, alvin said that he did not do it. he was emphatic in saying that he did not do it. >> you stabbed him. >> i didn't. >> why did you stab him? >> i didn't. >> alvin, the autopsy shows you did. you hit him in the throat with something? >> no. >> you hit him in the head with something? >> no. >> you didn't do nothing? >> no. >> i don't believe that. >> the police continued saying, alvin, until you tell us what we want to hear, you will not be able to go home. >> but during the second day of interrogation, alvi