As far as "rattler hunting" and the legalities of such, in the state of Az (if one intends to collect specimens) a valid Class F or G hunting license is required...one can purchase such a license at any local Wal-Mart of sporting goods store. If you're an out-of-state visitor, the license isn't cheap, but I can say that for in-state residents it costs roughly 25.00 or so for the whole year. I believe out-of-state visitors can purchase permits in daily increments (i.e. a 3 day permit or 7 day permit, etc.) You'll want to research this further as (being an Az resident) I've never had to.
Az has bag limits on native crotalids, and one is allowed to have in their possession at any one time up to 4 specimens of the native unprotected species. (Protected Az species are C. willardi, C. pricei, C. lepidus and Sistrurus...there is no "open season" on these and therefore they are illegal to collect at all times.)
In terms of finding a "tour guide", are you planning on collecting, photographing, observing,? If you are from out of state (and it sounds like you are) it is legal to (legally) collect native crotalids (unprotected) and export them. However, native Az crotalids (and their progeny) are not to be sold, bartered, traded, etc....disposal is done through gift to another or as otherwise directed by AzG&F. Legally, this even applies once the animals are outside of Az.
If you're planning on handling & collecting these animals, are you experienced? One might have concerns that an inexperienced person that engages in these activities has the potential to damage our legal standing as venomous keepers in Az. Also, it's possible that the "tour guide" could be held partially responsible if they help you find rattlesnakes and an accident happens.
Understand that I'm not saying that you're inexperienced...I don't know you...but I am saying that these are valid concerns to consider before your trip. Anyway, hope this has helped. Good luck to you.
-AzAtrox
