The UFC made the announcement Thursday.
“The UFC organization was notified today that the U.S. Anti-Doping Agency (USADA) informed Kelvin Gastelum of a potential Anti-Doping Policy violation involving Carboxy-Tetrahydrocannabinol (“Carboxy-THC”) which is a metabolite of marijuana and/or hashish, above the decision limit of 150 ng/mL, stemming from an in-competition sample collected in conjunction with his recent bout in Fortaleza, Brazil on March 11, 2017,” the UFC expressed in a statement. “As a result of the potential anti-doping violation against Gastelum, USADA has placed him under a provisional suspension. While the UFC Anti-Doping Policy affords Gastelum full and fair due process rights before any possible adjudication of his case, because of the proximity to Gastelum’s scheduled June 3rd bout against Anderson Silva, Gastelum is being removed from the card and a replacement is currently being sought.