Carpool Driver Caught with Elaborately Disguised Mannequin as Passenger

Two heads are better than one -- and, absolutely necessary to ride in the carpool lane -- but ya gotta make sure those heads are flesh and bone ... and not plastic, like this one was. One driver learned that lesson the hard way in Santa Fe Springs, CA -- a suburb in L.A. County about 12 miles southeast of Downtown L.A. -- when a California Highway Patrol officer pulled them over ... and discovered a dressed-up…