GRASS LAKE TWP, Mich (WLMI)  A Chelsea teen is jailed after police say he broke into several cars in Jackson County.  The 17-year old was taken into custody over the weekend after a man discovered him breaking into his car in Grass Lake Township.  The man held the teen at gunpoint, but he ran off.  He was arrested a short time later when he returned to retrieve his own vehicle.  The teen admitted to breaking into cars—officers found stolen money, iPods and several GPS units.