What is the Jehovah's Witness official viewpoint of 12-step programs like AA?

I've been meeting with a Jehovah's Witness lately for some study. I've asked questions similar to this and not received a clear/official answer - just an opinion. I've searched Google and only found the opinions and experiences of Witnesses who secretly use AA (Alcoholics Anonymous) or ex-Witnesses sharing their ideas. From those stories I think I have an idea of what the answer is, but I'm wondering what the official stance is (and why) if one exists.