fore in these cases. >> the tale you should remember is the tale of the scott pa neti case. he's on death row in texas now. panetti tried his case represented himself in a purple cowboy suit subpoenaed jesus christ john f. kennedy and the pope. the jury in that case found him guilty in an hour in one day and sentenced him to death. so another texas jury. so it's a tough defense in tough texas. >> all the expert witnesses, they aren't created equal, but it's often contradictory. >> oh, very much so. and in fact that's why you see such a huge disparity in insanity cases. with sometimes even very similar scientific or psychiatric evidence. ultimately all that science has to be decided by a lay jury and that's why you get those inconsistent results. so we've seen these arguments