On April 9, 2015, the 24th and final subject was enrolled and treated in our ongoing study of MDMA-assisted psychotherapy for 24 U.S. veterans, firefighters, and police officers with treatment-resistant PTSD. The first subject was enrolled in November 2010. Nine of the 24 subjects have also enrolled in our ongoing sub-study, in collaboration with researchers at the Medical University of South Carolina (MUSC), of the physiological effects of MDMA-assisted psychotherapy. This sub-study is using heart rate variability (HRV) and functional magnetic resonance imaging (fMRI) to explore correlations with clinical outcomes. Principal Investigator Michael Mithoefer, M.D., will share preliminary results and ongoing research into MDMA-assisted psychotherapy for PTSD at the upcoming American Psychiatric Association Annual Meeting in Toronto, Canada, from May 16-20, 2015. MAPS will also host an educational booth in the exhibit hall.