No he wasn't
"On the same day, the Major League Baseball Players Association issued a statement[16] pointing out that because of several factors, any player appearing on the list compiled by the federal government in 2003 did not necessarily test positive for performance enhancing drugs. Among those factors were that the total number of players said to be on the list far exceeded the number of collected specimens that tested positive. In addition, there were questions raised regarding the lab that performed the testing and their interpretation of the positive tests. Also, the statement pointed out that certain legal supplements that were available over the counter at the time could possibly cause a positive test result."