A climber who was half-naked — and possibly high on mushrooms — was rescued from the First Flatiron on Friday afternoon, according to the Boulder County Sheriff’s Office.

At 12:35 p.m., officials received a call from a climber saying his friend was “not acting right” and required assistance as the two were climbing the First Flatiron. Both men were 25 and visiting from Missouri, according to a news release.

Emergency crews were able to retrieve the climber, who was treated and released from Boulder Community Hospital.

Deputies found psilocybin mushrooms — a hallucinogenic — on the climber who called the rescue in and arrested him on suspicion of felony possession of a controlled substance.

Investigators say the rescued climber may have been under the influence of the mushrooms and could face drug charges.

Also, deputies say they think a civilian may have been bitten by one of the climbers during the rescue .