kilowatt,
It's in the Wyoming Game and Fish Dept. Laws book, sec.23-6-208, "Forfeiture of devices and equipment used in taking game illegally". Any artificial Light source which is mounted to a bow or firearm is illegal for the taking of game animals, including ill. reticals and fiber optic pin lights and since the rangefinding rifle scopes are battery operated I am pretty certain they would apply also.
wyoelkchaser