The New Fairfield Resident Trooper's Office is investigating three cases of drivers passing stopped school buses.  State Troopers are reminding motorists that the First Student bus fleet is equipped with working cameras.  The fine for passing a school bus with its red lights on is $450.  It's a fine of $500 to $1,000, up to 30 days in jail, or both for subsequent offenses. School bus drivers have also been instructed to provide police with the violator's license plate and vehicle description so Troopers can take enforcement action.