http://profootballtalk.nbcsports.co...-positive-ped-test-for-duane-brown-last-year/
http://espn.go.com/nfl/story/_/id/1...exans-lt-suspension-prompted-meat-warning-nfl
http://espn.go.com/nfl/story/_/id/1...exans-lt-suspension-prompted-meat-warning-nfl
According to sources, the NFL Players Association proved to the NFL that the burgers and steaks Brown ate in Mexico caused the positive test. Consequently, on Tuesday, the drug program's independent administrator sent a letter warning players that consumption of too much meat in Mexico and China could cause a positive test for the anabolic substance clenbuterol.
Clenbuterol has been used to control asthma and as an unregulated weight-loss supplement. It is not used in any medication approved by the Food and Drug Administration and is banned by the NFL.