Anybody can be in your backyard. Its when you tell them to get off & they don't, then its an issue. So, just being on your property is not a big issue - if he is searching your house then that may be. To avoid further issues, write a notice of tresspass to you village clerk informing them that no employee of the village may go on your land, including police. Then if they come on your land again, you call 911 and order him arrested (or you can arrest them but I would advise against this due to civil liability).

