Buy a few of the Trail Camera's that send the pictures to Your cell phone,Internet and Web Site Host...that way You have pictures of anyone trespassing or poaching then prosecute to the fullets extent,make sure You have plenty of No-Trespassing Signs up around your property so they can't say it wasn't Posted.If They destroy your camera's You'll still have photo's of them and make them pay from property damage too!Here's a list of a few trail camera's that send out pictures that may help You catch your Theif's/Poachers?
www.smartscouter.com
www.moultriefeeders.com
www.dlccovert.com