Summary: CargoNet received information that a tractor, trailer and cargo had been stolen. An alert was sent out and a member of the LASD located the trailer attached to an unrelated stolen tractor. The thieves changed the plates on the trailer. However the Sheriff's Officer became suspicious when the trailer was connected to a stolen tractor. The VIN matched what was indicated in the CargoNet alert and both vehicles were towed back to LASD yard. The tractor and cargo are still missing.