Used to watch Jai Alai at the old MGM Casino in Reno back when I was book learnin at UNR a thousand years ago. Couldn't remember a name if a gun was at my head (probably couldn't pronounce it anyway - most were Basque or south American). Was a blast to watch even though after the 4th or 5th bourbon & water trying to follow that little round missile was next to impossible.
Never heard that it was illegal - just not well attended. MGM carried for 8 - 10 years as I recall. There were a few times when other than the 2 or three of us there the place was empty but for the cocktail waitresses. Can't imagine why it'd be illegal except for the gambling aspect to it - not a problem in NV.
If you're lucky enough to be on private land and can leave your stand up during the off season you can tie an old piece of cloth or something of the sort to your stand. I like to use an old camo bandana that I have. That way the deer get used to the movement and eventually don't bother even looking up when there is slight movement. This may just give you the time to draw your bow or raise your gun without being detected.