CNN's Randi Kaye reports on the argument made by an expert witness for the defense in the Jodi Arias trial who says the trauma of killing Travis Alexander caused memory loss. Psychologist Richard Samuels told the court that Arias suffers from dissociative amnesia, which supports her claims that she can't recall stabbing her ex-boyfriend almost 30 times after she shot him.
The prosecutor took aim at Samuels for an ethics violation fine, for treating Arias by buying her a self-help book, and for using old and inaccurate data to conclude that Arias has PTSD.
For expert analysis, watch Toobin: Arias witness looked awful
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