This is an opinion piece, but one by the head of the Vancouver Athletic Commission so not some Joe Schmoe writing an opinion piece for Yahoo Sports.
Nick Diaz's recent post-fight positive test after UFC 143 for marijuana has caused many fight enthusiasts to ask: "Why do they test for marijuana anyway?"
The answer to that question, along with a review of Nevada's applicable regulatory provision, suggests that there is no basis for disciplinary sanction of Mr. Diaz unless he administered or used marijuana immediately prior to or within several hours in advance of his fight.
Cannabinoids are only prohibited "in competition". WADA expressly permits the use of marijuana and other cannabinoids outside of competition. Nevada is no different.
A random, out of competition positive test for marijuana should not engender disciplinary sanction under the NAC's regulations.
NAC 467.850(1) provides that the administration of or use of any prohibited substance "either before or during a contest or exhibition" is prohibited.
The obvious question is this: how long before is "before", under NAC 467.850(1)? A day? A week?
Media commentators have correctly pointed out that the presence of metabolites in a sample taken on fight night is consistent with the last "administration of or use of" the prohibited substance having been many days if not weeks earlier.
Is the use of marijuana potentially weeks in advance of a fight a violation of NAC 467.850(1)?Marijuana metabolites are not evidence of an anti-doping violation.MUCH MORE AT THE LINK