Sad, but true. We have called the game warden a couple of times about poachers but the standard answer is you have to have proof.
On a hunting forum I visit some one did get good picture from a hidden camera of poachers in action killing and cleaning a deer right in front of the camera. Several clear pictures of the 2 guys. Turned the pictures over to the game warden and they are on the lookout for them.
Best bet would be to buy several of the cheaper game camera's and hide them around the trails where you can get clear pictures without them noticing.