I think that most game tickets have some disclaimer printed on them that states that the team/organization can either revoke the ticket or kick someone out for whatever they want.
My TN Titans ticket says this:
Quote:
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The NFL and/or Tennessee Titans and/or The Coliseum may refuse admission to, or eject, any ticket holder without refund who is deemed to be disorderly, or who fail to comply with these license terms or any security measures or Coliseum directives.
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I would assume that ND tix say something similar.