Jodi Arias’ defense expert witness Richard M. Samuels has testified that Arias suffers from post traumatic stress disorder and dissociative amnesia. Arias is on trial for the murder of her boyfriend Travis Alexander in 2008. Dr. Samuels, Ph.D., FACCS, ABPP, is a practicing clinical and forensic psychologist in Scottsdale, AZ. He testified that that the 2008 event was so traumatic for Arias that she cannot remember details.