Is your vehicle private property? The answer seems obvious: of course it is. But depending on where you parked it, you might give up some rights in actually keeping it "private." Police can place a tracking device on your car without a warrant, according to recent judgment in California.
Earlier this year, an Oregonian named Juan Pineda-Moreno was convicted of growing marijuana after police tracked his car to a suspected growing site. Pineda-Moreno appealed, citing the fact that on two occasions DEA agents placed tracking devices on his car while it was in his driveway -- which he considered private, not public, property -- and therefore breached his Fourth Amendment rights.