One of the socially conscious activist musicians on the Vote for Change Tour, Dave Matthews, dumped his tour bus’s toilets all over a bunch of tourists on the Chicago River, and may now face criminal charges: Dave Matthews Band May Face Criminal Charges Over Bus Stink.

Authorities in Chicago are considering criminal charges against the Dave Matthews Band after reviewing surveillance footage of an August 8 incident in which the group’s tour bus allegedly dumped human waste into the Chicago River.

Police Commander Michael Chasen said he’s certain that the band’s bus is the culprit, thanks to the footage, which was shot from nearby buildings and shows a bus crossing the bridge as a tour boat passes below (see “Dave Matthews Band Sued For Stinking Up Chicago River”). Criminal charges could include violations of public nuisance laws and ordinances to protect public health and safety, according to The Associated Press.

Chasen said Dave Matthews Band bus driver Stefan Wohl told police that he crossed the Kinzie Street bridge near the time the incident took place, but that he did not say whether he was responsible for dumping the 800 pounds of human waste through the bridge’s metal grates. A tour boat with unfortunate timing and a group of 120 passengers aboard was doused with the refuse as it passed underneath.

Around two-thirds of the passengers sitting on the upper deck of Chicago’s Little Lady were hit with the falling waste, the Chicago Tribune reported. Five passengers went to Northwestern Memorial Hospital for testing and all received refunds on their $25 tickets.