The UFC announced Brock Lesnar has been flagged by the U.S. Anti-Doping Agency for a potential violation stemming from a pre-UFC 200 test.
UFC says USADA learned of the potential violation late Thursday night ... 5 days after the fight.
There are some UFC fighters applauding USADA and the UFC for cracking down on PED violations -- including Luke Rockhold ... who told us he believes PEDs are a huge problem in the sport.
But he also thinks the strict testing will help clean it up.
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