Suggest that you look under the following link for most recent (ATF P 5300.5) State Laws and Published Ordinances - Firearms
(2007 - 28th Edition)

Find link for Nevada and then read on...
many states allow unrestricted sales between personal parties, but at gun shows, this may be restricted either by state law or the show sponsors....easy enough to check out prior to the show.
Yes, check individual driver license as an ID source