Some industries are able to enforce bans much easier than others.
Large casinos have cameras everywhere and facial recognition software running all the time that will alert security if any matches are made. Either for good customers (VIPs) or bad ones (banned people).
Airlines have a databases that they reference whenever they issue a ticket – a national no-fly database (e.g. suspected terrorists) and a database specific to the airline (e.g. previous troublemakers).
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