The Department of Health and Human Services has approved a study proposed by MAPS to research the effects of smoked or vaporized marijuana on 50 veterans with treatment-resistant PTSD. The review committee noted improvements made to the study including modifications to improve subject safety and additional information provided about the research team. Based on these changes, the committee has cleared the study to purchase research-grade marijuana from NIDA. The committee encourages MAPS to consider further suggestions to strengthen the study such as redefining "treatment resistant", employing an independent entity for data management and analysis, and simplifying the study protocol.