“First and foremost, I just want to say that I did not take a performance-enhancing drug,” Dunbar told the St. Louis Post-Dispatch. “I mistakenly took something that prompted a failed drug test. I want to say that I sincerely apologize to my teammates, the organization, Coach [Jeff] Fisher, [General Manager] Les Snead, my family, and friends. I’m deeply saddened by this but I plan to serve my four-game suspension and get back to playing football as soon as possible.”
Asked what banned substance he tested positive for, Dunbar refused to answer.
“I just don’t want to get into that right now,” Dunbar said. “That’s something we don’t want to talk about — we just want to move past.”
When the NFL suspends players for banned substances, it doesn’t reveal the specific banned substances that turned up in the players’ drug tests. So with Dunbar refusing to say what he mistakenly took, there’s no way to know what the specific violation of the PED policy was. All we know is that Dunbar won’t play in the first four games of the season.