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.
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.