> 1. Every person who makes or mends or causes to be made or mended, or has in his possession in the day or nighttime, any engine, machine, tool, false key, picklock, bit, nippers or implement adapted, designed or commonly used for the commission of burglary, invasion of the home, larceny or other crime, under circumstances evincing an intent to use or employ, or allow the same to be used or employed in the commission of a crime, or knowing that the same is intended to be so used, shall be guilty of a gross misdemeanor.
Having lock picks in your possession coupled with the circumstances that suggest you intend to use them would be a crime.
It wouldn't be a stretch to find someone with a flipper poking at things could run afoul of this law.
It is in the "a flipper is legal, but be very cautious having it... and if you were some place where you shouldn't be and had a flipper, it could make things worse."
Its not a "don't have it" but don't walk around with one and fiddling with it / sniffing / doing replay attacks."
The thing that you don't want to do is go walking down a hallway in a hotel (which are of course under video surveillance) and have a utility room door pop open.
If you have a legitimate use - go for it. If its "I brought mine because I'm going to a hacking convention in Vegas" it is now a "think about if you really want to be carrying it around" - its more likely to borrow trouble and if you "accidentally" open up some place you shouldn't have access to, it makes things worse.