The UFC are changing the way it tests fighters for marijuana following the lead of the World Anti-Doping Agency.

It now means that fighters will have to take more marijuana for them to be tested positive.

The rule is in effect immediately and the UFC Vice President of Regulatory Affairs Marc Ratner reveals they enforced it because they're are following the World Anti-Doping Agency's standard.

"When we self-regulate around the world, we are going to go the WADA standard of 150," said Ratner in a press conference. "So we're starting that immediately," said Ratner.

Many UFC fighters have been stung with the strict marijuana rules in the past including Dave Herman, Thiago Silva, Matt Riddle, Alex Caceres and most recently Pat Healy.

Wins have been struck off their records, winning prize money has been forfeited and time spent serving suspensions have been the punishments for previous offenders. 

The offenders list seems to be growing after every event but UFC has taken large strides in an attempt to repair their system. UFC officials are raising the testing threshold for marijuana metabolites from 50ng/mL to 150 ng/mL.

The UFC will send a recommendation to the Nevada State Athletic Commission to think about raising it's own test threshold to a similar number.

Pat Healy, who was most recently found guilty of testing positive for marijuana, lost $130,000 in bonuses after UFC 159. Matt Riddle tested positive twice and, on the second occasion, was cut from UFC.

Attitudes and laws are changing in the USA regarding marijuana so fighters being heavily punished by strict UFC rules were a controversial decision.

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