Point of information: do teams actually not allow certain fans to come back another time? If so, how do they enforce it? When I pass through Security on Yawkey Way at Red Sox games, and every other ballpark I can recall, at no point is my ID an issue - simply metal objects. (And one time, at Oakland Coliseum, a decorative stone I keep in my pocket was an issue that I was able to talk my way through. Hey, it's Oakland, I immediately understood their concern, although this was baseball not football.) My guess is that they get a restraining order in place, and then if the miscreant gets ejected a second time they have the evidence to really throw the book. But that's not quite the prior-restraint some here seem to be calling for.