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I am wondering, is it possible for Marriott hotels to forbid the use of personal hotspots? Part of the ToS guests have to sign? Could they then use their Wi-Fi monitoring system not to disrupt the customers hotspots, but to identify them and then fine the customer?

Ok, being able to send "de-authorization" packets does not mean to be able to identify or localize the hotspot. And doing this in the open is surely not a way to get more guests. So this is more a theoretical question.