Baltimore Ravens safety Tom Zbikowski failed a post-fight drug test after his first-round knockout of Blake Warner on Saturday, according to the Associated Press.
The newspaper reported that TCH, an ingredient in marijuana, was found to be in Zbikowski's system.
"We're appealing it," Zbikowski's manager Mike Joyce said, according to the Sun-Times. "After the fight, all the fighters tested were positive. They had you pee in a cup and put a strip of something in there. I've never seen results where you get them the day of the fight. It was like a home pregnancy test or something."
It could be a major setback for Zbikowski (4-0), who has become a fan-favorite since stepping into the ring for his first profressional while still playing for Notre Dame.
Zbikowski is scheduled for another test today.