[foxhole]

I have found cheep home made motion sensor usually does the trick, we originally did it to keep deer away from the vineyard but works great for people too. Just run a fishing line round the perimeter through a bunch of them little eye screw things in the side of the building and stakes or what have you and run it up to a rat trap. drill bout a 5/8 hole in the trap and silver solder a nail on the snappy part. put a shotgun shell in the trap and set it. if the wire gets tripped the shell goes off. Makes a bang, shot has no backing so it can't go far. just kinda goes bang. Should scare em off, works good on the deer