Cynthia Calvillo’s first career loss just got a little bit worse.

Three weeks after dropping to 6-1 as a pro with a unanimous decision loss to Carla Esparza at UFC 219, the promotion announced Wednesday that the 30-year-old Calvillo has been notified of a potential UFC anti-doping policy violation after failing a USADA drug test for Carboxy-Tetrahydrocannabinol (THC). The positive test stems from an in-competition sample collected in relation to the Dec. 30 bout, which took place in Las Vegas, Nev.

Carboxy-THC is described in the release as “a metabolite of marijuana and/or hashish.”

Calvillo is expected to go through am adjudication process with USADA and the Nevada Athletic Commission (NAC), which also has jurisdiction in the case, to determine what sanctions she will receive.

The most recent case of a UFC fighter failing a marijuana test involved middleweight contender Kelvin Gastelum. He was flagged by USADA last April, which led to a win over Vitor Belfort being overturned to a no contest, a subsequent booking against Anderson Silva at UFC 212 being canceled, and a three-month suspension.

The UFC’s statement can be read below.