Jodi Arias’ defense attorney worked Wednesday to undo any damage to the credibility of an expert witness who diagnosed the defendant with post-traumatic stress disorder and amnesia after a withering cross-examination that called into question his techniques and testing procedures. Psychologist Richard Samuels resumed testimony for a fourth day Wednesday after telling jurors he diagnosed Arias with PTSD and dissociative amnesia, which explains why she can’t remember much from the day she killed her lover. Samuels said he met with Arias a dozen times for more than 30 hours over three years while she was jailed. Prosecutor Juan Martinez previously seized on multiple lies Arias told Samuels throughout the process of his evaluation, at one point getting the psychologist to acknowledge that he should have re-administered at least one test he used to come to his PTSD diagnosis. Martinez questioned how Samuels could have come to any definitive conclusion for a diagnosis based upon Arias’ li