This is a huge problem around here. There are about half a dozen people who are notorious road hunters. Eveyone knows who they are, yet they never get caught. I would be willing to bet one these guys shot the deer off your place. The game wardens know exactly who they are, but can't seem to catch them in the act. There are probably just as many trophy class deer shot from the road than by legal hunters in Jackson county every year. I don't know what the solution is.
Some have been caught, several times and will never stop, until someone puts a bullet in them.
