Additionally, USADA said Diaz’s in-competition urine and blood samples came back clean of all prohibited substances, including cannibidiol.
“Based on these circumstances, USADA determined that a public warning was an appropriate response to Diaz’s use of a specified substance during the in-competition period,” the agency said.
Diaz, who the USADA says “accepted” the warning, has not publicly commented on it.
The ruling follows that of the Nevada State Athletic Commission that oversaw UFC 202 in Las Vegas in August. In early September, NSAC also decided against penalizing Diaz for using the substance at the news conference.