On January 16, 2012, the official study initiation took place for our upcoming relapse study of MDMA-assisted psychotherapy for PTSD. The first subject will be enrolled shortly thereafter. This study will enroll two subjects whose PTSD symptoms eventually returned after participating in our flagship study of MDMA-assisted psychotherapy for PTSD, which was completed in July 2010. This is an open-label proof-of-principle study intended to test whether an additional MDMA-assisted psychotherapy session and several associated non-drug psychotherapy sessions can once again free these subjects from a diagnosis of PTSD. This study is the first time we are offering an additional MDMA-assisted psychotherapy session after a considerable amount of time has passed (up to 64 months) after completing assessments following the initial therapy.