Charlie Sheen claims AA has a 5% success rate -- is he right?

By Los Angeles Times

Actor Charlie Sheen's recent rambling rants included several tirades against the 12-step program popularized by Alcoholics Anonymous: He called it a "bootleg cult" and claimed it had only a 5% success rate.

While we're not believing much of what Sheen is spouting, that 5% statistic has people talking. Does the massively popular program really do that bad a job at combating