THE ENDOCANNABINOID SYSTEM PROVIDES AN AVENUE FOR EVIDENCE‐BASED TREATMENT DEVELOPMENT FOR PTSD 15 Sep Dr D Antidepressant-like effect of delta9-tetrahydrocannabinol and other cannabinoids isolated from Cannabis sativa L. Reductions in circulating endocannabinoid levels in individuals with post-traumatic stress disorder following exposure to the World Trade Center attacks.