A school-bus company is investigating after a driver for the Anoka Hennepin school district was arrested for allegedly being drunk on his route.First Student Bus Company fired the 51 year old driver from Andover.He faces charges of driving while impaired and driving a school bus while impaired.The dispatcher smelled alcohol on the man's breath when he showed up to work Wednesday, but by the time a trooper stopped him the driver had picked up a special needs student.The company says it has apologized to the parents of the lone student on the bus.