I don't know. I've been to plenty of sporting events where alcohol is served, baseball, football (both American & proper football), hockey, basketball, etc, and I've never seen any problems.

One of my fondest memories is sitting in Yankee stadium with my husband enjoying a pretzel and a beer.

I'm not saying there's never been a problem with drunkenness at games, but it's not as common as you think and I'm willing to bet that the people who caused it were drunk before they showed up.

I don't remember any reports of problems caused by alcohol at the last 2 Cups.