Hell most weeks we usually have shooters or flasks being passed around in our section and the colder it gets the more beer that gets smuggled in too. Granted we are in the upper deck looking across the end zone so the ushers may not care as much but as long as you aren't obvious or stupid about it no one has ever been bothered for drinking around us.
Ha - usher in front of me took an entire 12 pack out of guys coat in front of me. Impressive work.