It goes on quite a bit here in southern MO. I know of 2 or 3 groups of guys that get together every Saturday, when the weather is good, in the Fall, Winter, and early Spring.
They use CB's or Marine Band radios to communicate, and have tracking collars on some of the dogs. When they turn the hounds loose, they will listen and get a general direction the race is going, then drive around to different stands. Most of the time, the dogs catch the coyote, so there's not a lot of shooting.
About 3 years ago, a bunch of them got busted for this type of activity, near Doniphan, MO. I don't remember all of the charges filed on them, but there were several.
I never heard the outcome of this case.