BF4L
Bruins homer
If the theater has a no firearms policy and he brings it in anyhow, that alone would be arrestable, no?
(Note that it doesn't say that in the article, but movie theaters often have something to that effect posted.)
If a buisness chooses to post a sign saying no firearms allowed then no firearms are allowed. So yes arrestable but I would bet the theater does not have any signs. Not many do.
Walmart used to do it some time ago.