This is an unfortunate situation. Everyone else should take the lesson hard learned by the OP not to mix business and personal life. UPS has these programs in place to cover themselves. Yes the OP needed help, now he knows it should have been outside the realm of UPS. It's one thing if you get a DUI and have to go through the UPS program, but to do it voluntary, no way. Had he tried AA through church or another community program, he wouldn't be in this position.
Good luck brother, I hope it turns out for you, but I've always seen alcohol and drugs big losers at panels.