I would definitely like to see some actual data regarding how prevalent and/or common this problem actually is compared to the number of transactions that take place at your "average" (?) furry fandom convention. Trying to set up a would-be "legal procedure" system based on anecdotal evidence is dangerous to say the least. And if it really is a problem, I'd say it makes sense to look at how other fannish events have handled things. Furry conventions are hardly the only fannish conventions or trade shows in existence -- and some have been doing business for a lot longer.
I would definitely like to see some actual data regarding how prevalent and/or common this problem actually is compared to the number of transactions that take place at your "average" (?) furry fandom convention. Trying to set up a would-be "legal procedure" system based on anecdotal evidence is dangerous to say the least. And if it really is a problem, I'd say it makes sense to look at how other fannish events have handled things. Furry conventions are hardly the only fannish conventions or trade shows in existence -- and some have been doing business for a lot longer.