In the lead up to the World Cyber Games finals in Germany, Gameplayer has an incredible interview with Tournament Director Alex Walker in which he freely admits knowledge of participants taking illegal drugs to enhance their performance. The interview came in response to a previous article by the site in which they examined whether there was a need to bring drug testing into professional gaming events to ensure a level playing field. Walker said, 'I've seen a number of players at national tournaments who came in "baked" (that's stoned for the uninformed) purely so they could play better. In most cases they did, although obviously they couldn't just pull out another joint midway through. In one WCG, a player I knew took amphetamines an hour before his match to boost his reflexes.'
Source: http://games.slashdot.org/article.pl?sid=08/08/28/1249210