If they aren't on duty I wouldn't see a problem. It's none of my business what adults that aren't on duty do in their free time.
It's none of yours either.
If you thought they were on duty, and drinking then why didn't you report it?
Edited to add - if it is against policy to drink in uniform then - that's another thing all together.
Last edited by Load Toad; 7th Jul 2009 at 09:07.