Panthers linebacker Thomas Davis announced over Twitter he earned a four-game suspension for testing positive for a banned substance.
"I was informed that I tested positive for a banned substance," Davis said. "I was completely caught off guard by this. I've never in any way done anything to try and intentionally cheat the game. It's one of those situations where the NFL rules are clear. They state that you are responsible as a player for what you put in your body.
He said all he's done was take the same supplements over the last 7 to 8 years and an estrogen blocker that triggered the positive test.