I used to bring a thermos of coffee and baileys to work in the morning. The aroma perked up a few ears but nobody said anything (and heck, it's not like that would be hard liquor).
I did some work with a company in England once, they had done some consulting with Guiness. So one day, a Guiness truck shows up with a full load. They had Guiness in their fridges (and back porch) for almost a year, and yeah, it got drunk all day long, but noone ever had any issues with it.
Personally, if I was running power equipment that could take off a finger (or worse), I wouldn't drink during the day out of self preservation
