I cant really think of a way they could trace back the different IPs at the various hotspots unless the hotspot was keeping a log of what MAC addresses were using what IP at what time (which wouldnt be much use, anyways), or, if it is a pay spot, keeping logs of who had what IP at what time.
So really, theres probably not much way. At least not that I can think of.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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