Maybe you missed the newsflash, this thread wasn't based upon drunk and high people going to work.
Read the drug and alcohol policy and CBA...miss the point you can be fired by UPS activities that did not happen at work. You can get DWI or DUI (depending on the state) say on a Friday night and go into the program under Article 35. If it happens again you are terminated by the contract. If UPS said you can not smoke a cigarette on the clock and the CBA says that you can be terminated if you do and you light on the clock...then bye bye! That's how it works!!! I didn't missed the thread...it was about would UPS change its Policy and no they wont nor will the Union try and force them to.