A quick google search tells me they don't really enforce it.
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How are such bans enforced? They're not. Stadium security personnel are tight-lipped about their procedures, but people in the industry say that little is done to prevent banned spectators from entering U.S. arenas. Some teams may stop rule-breakers from buying tickets online, but that wouldn’t interfere with their acquiring tickets through friends or scalpers and entering the stadium anonymously. A "lifetime ban" simply makes it easier to prosecute a repeat offender. The team wouldn’t have to prove that the suspect instigated a fight or threw something on the field, because his mere presence in the stadium would constitute trespassing.
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http://www.slate.com/articles/news_a...ing_back_.html