The UFC will no longer punish fighters for using marijuana in most cases. That's a major change to its anti-doping policy.
The world's largest mixed martial arts promotion will no longer worry about positive tests for carboxy-THC, the psychoactive ingredient in cannabis, unless it believes a fighter used it intentionally to enhance performance.
All other cannabinoids derived naturally from marijuana are no longer prohibited substances.
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The UFC won't allow fighters to compete while under the influence of cannabinoids, but the promotion recognizes that MMA fighters often use marijuana for pain management or relaxation.