SPRINGFIELD — State law says drivers in serious traffic collisions automatically consent to alcohol and drug-testing.But the state’s highest court pared down that law this morning, ruling it unconstitutional as-applied to a driver who refused a test days after a fatal crash.In a unanimous decision, the high court wrote that a line of Fourth Amendment cases makes clear a drivers’ privacy rights are only temporarily reduced when he or she is in a serious incident.“These factors were simply not present …