CHICAGO (CBS 2) Rock star Dave Matthews and his tour bus driver are facing a filthy lawsuit. The Illinois Attorney General's office says they're responsible for dumping up to 100-gallons of raw human waste from a tour bus onto the Kinzie Street Bridge earlier this month. The nasty mess rained down on passengers aboard a sightseeing boat two weeks ago. The suit charges both the band and the bus driver with violating state water pollution laws, as well as common law public nuisance laws. A spokesman for the band says all of its tour buses were parked at the time...