Are they illegal? Maybe so but in MO I am not really sure. It would be a pain, having to point that thing around all the time, more movement etc., batteries would go bad, and it would make it impossible for me to take naps.
Now one like they use on the "where is bigfoot" shows, that they put on a remote control helicopter would be pretty handy, make a pass over my stand area, if nothing shows up back to sleep!!