Dillashaw announced the news on his Instagram account:
The 33-year-old Dillashaw dropped down to flyweight in January to battle Henry Cejudo for that belt. He lost the fight in 32 seconds. That was the fight he tested positive for.
Dillashaw won back the the bantamweight title at UFC 217 with a win over Cody Garbrandt, then defended it against him again at UFC 227.
Dillashaw is 16-4 and has become one of the bigger draws the UFC has on its roster. The fight against Cejudo was almost specifically designed to make Dillashaw a two division champion and potentially wipe the flyweight division from the map.
The New York State Athletic Commission claims it has suspended Dillashaw for one year and fined him $10,000 for “violations relating to the use of a prohibitive substance.” The suspension will be retroactive to January 19, the date of the Cejudo fight.
Cejudo had hoped to move up to bantamweight and challenge Dillashaw for his belt, but that appears to be off the table now.