Marijuana didn't show up in Nate Diaz's system, but that doesn't necessarily mean he won't be sanctioned.
Diaz passed his UFC 202 fight-night drug test administered by USADA, UFC vice president of athlete health and performance Jeff Novitzky told MMA Fighting on Monday night. However, USADA is still reviewing Diaz's use of a cannabidiol (CBD) oil vape pen at the post-fight press conference that night, per spokesperson Ryan Madden.
Though Diaz's drug test was clean, him telling the media he was vaping a CBD oil pen could fall under the "admitted use" clause in the UFC's anti-doping policy run by USADA.