When had many U.S. regulatory bodies and fighting promotions adopted the Unified Rules of Mixed Martial Arts?

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Two mixed martial arts fighters face off inside a caged ring, viewed through the chain-link fence with a referee and audience in the background. — mixed martial arts Two fighters competing in a mixed martial arts contest.

By 2009, many regulatory bodies in the United States and numerous fighting promotions worldwide had adopted the Unified Rules of Mixed Martial Arts.1

These standardized regulations were instrumental in helping the sport gain mainstream recognition and global acceptance. The rules established clear guidelines for combat, including the use of strikes, throws, kicks, and grappling, while strictly prohibiting dangerous actions such as headbutting, eye gouging, biting, and groin attacks. Under these standards, bouts are structured into three or five rounds, with judges determining the outcome if a knockout or submission does not occur.21