A Bethel man has been arrested on drug charges after State Police Troopers investigated a routine motor vehicle violation.  31-year old Peter Wertz was in a Southbury commuter lot when Troopers noticed an improper use of a license plate.  They approached the car and saw drug paraphernalia in plaint sight.  Troopers uncovered 22 bundles of suspected heroin, 14 suspected Xanax Pills and 9 hypodermic needles.  Wertz was released on bond for a December 11th court appearance.  State Police noted that the commuter parking lot is located about 1,000 feet from the Troop A barracks.