In a bunch of the episodes from season 1 they had the unit 636 either leading a pursuit or being involved in a part of the show. It was later into the show on TV recently aired that a person in the show had a multiple personality disorder and during a police chase he stole the car 636. In that episode I realized that it couldn't be a coincidence and unit 636 has to have a back story or meaning. please help me out with this theory.