Retired Maj. Gen. Glenn Curtis spent a decades-long career climbing the ranks of the Army, deploying in 2004 to Iraq and returning home to eventually serve as the leader of the Louisiana National Guard under two governors during major hurricanes, floods and other disasters.

But he found himself in unusual territory earlier this year, as he trekked alongside other veterans to a clinic in Mexico. They all sought the same opportunity: a chance to ingest a powerful psychedelic from Africa called ibogaine, which is illegal in the U.S.

Curtis and his son had traveled to Tijuana as part of an ongoing pilgrimage of military veterans , many of them former special forces operatives who face debilitating symptoms from traumatic brain injuries, post-traumatic stress disorder and other conditions

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