Damn, I hate when that happens!
Two years ago I was in my stand on public land when I heard something. I watched a guy walking around with a walkman spraying blue paint on the big trees. I scared the **** out of him when I dropped something next to him when he was painting the tree I was in. Turns out he was marking them for logging. All next summer into fall they were tearing that place up. It hasn't been the same since.