Jodi Arias Trial: Psychologist's Testimony in Question

Dan Abrams and Nancy Grace discuss testimony from the defense's psychologist.
3:54 | 03/20/13

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Transcript for Jodi Arias Trial: Psychologist's Testimony in Question
For more now we bring in our legal team, nancy grace the host of "nancy grace" on hln and dan abrams. I want to start with you, nancy. Prosecutor tearing into the expert conceding a lot of points. Quite simply how big a blow was this to the defense? Well, it's a huge blow. Especially following jodi arias on the stand and I've got to tell you she did fairly well on direct examination. She started falling a on cross-examination. But then when the jury started asking her questions, it was so bad she actually got a cold sore in the middle of the jury questioning. This was supposed to -- this testimony by the expert, dr. Dick samuels, was supposed to tie all that together and make sense of it. Instead, he was carved up like a thanksgiving turkey and made out to be either a liar or incompetent. Yeah, this didn't go well. There's no question, yeah, for the defense. It went really bad. Yes, it did not go well, but the question is, did they really need this kind of witness? Meaning this is a very tough defense to get a scientific explanation for, right? So I think the defense might have been better off by just having jodi arias' testimony out there. I don't agree with nancy that it was quite as bad in terms of the falling apart -- oh, really gentleman. Because, look, her basic account is the tough part for her. I think -- did you see that cold sore? I'm not certain what the relevance of the cold sore is. You've mentioned it now twice. Asked for jury questioning -- I guess. Come on. You've got a doctor, right? How often has your urologist sent you greeting cards? I mean this doctor on the stand is sending her greeting cards, sending her books as presents and it came out almost at the very beginning that he was reprimanded and fined professionally in new jersey for bartering his services for dental work. Yeah. Look, the reality is that jodi arias had testified and they had just left it out there and maybe a juror or two bonded with her in some way, that would be a huge win for the defense. attacked and cross-examined and undermined the way he has been, the defense I think is in an even tougher spot. If any of the jurors were thinking, well, maybe it could be and then they hear this guy get attacked the way he did, i think the defense is now taking a step back rather than a step forward. Nancy, the defense expert now will be facing some later. Reportedly they have submitted very many for them. What do you expect to see today? Basically it'll be take no enemies questioning because that jury does not hold back. They ask all the questions we want to ask and here's the problem with not calling an expert. This is a mental defense for jodi arias. It's a self-defense defense. Suffering from posttraumatic stress syndrome and does not recall what happened. That is part, dan, of a very complicated self-defense, a they have to call an expert, a medical expert. No, they don't. Otherwise, that can be brought up on cross-examination and it can also be brought up in closing arguments. Yeah. Production of a vital witness -- I'm sorry. I'm having a problem hearing. I keep hearing dan in my ear. I know because every once in a while the corrections are necessary, so that's what you're earring in your ear like sa nancy, you got that one wrong. Yeah. We have lots to get to. Jodi arias spent 18 days on the stand and we'll discuss that and many more things to come here, dan and nancy, thank you very

This transcript has been automatically generated and may not be 100% accurate.

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