A van full of U.S. Special Operations veterans crossed the border into Mexico on a sunny day in July to execute a mission that, even to them, sounded pretty far out.. Listen to this article with reporter commentary. Over a period of 48 hours, they planned to swallow a psychedelic extract from the bark of a West African shrub, fall into a void of dark hallucinations and then have their consciousness shattered by smoking the poison of a desert toad.. The objective was to find what they had so far been unable to locate anywhere else: relief from post-traumatic stress disorder and traumatic brain injury symptoms.. “It does sound a little extreme, but I’ve tried everything else, and it didn’t work,” said a retired Army Green Beret named Jason, who, like others in the van, asked that his full name not be published because of the stigma associated with using psychedelics.. A long combat career exposed to weapons blasts had left him struggling with depression and anger, a frayed memory and addled concentration. He was on the verge of divorce. Recently, he said, he had put a gun to his head.. We are having trouble retrieving the article content.. Please enable JavaScript in your browser settings.. Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.. Thank you for your patience while we verify access.. Already a subscriber? Log in.. Want all of The Times? Subscribe.