George Washington University students who get drunk and throw up on the university's shuttle bus now have more to worry about than a hangover.

The school has announced that students who drink until they are sick could be charged hundreds of dollars to clean up the bus, plus the cost of cab vouchers for other students trying to get home. The policy will be enforced by "mystery riders," who could be on board at any time.

The Vern Express runs round the clock between the university's Foggy Bottom and Mount Vernon campuses. University officials say when someone gets sick, the driver has to stop the bus, unload the passengers and arrange rides home.

The policy follows an increase in the number of incidents and complaints from students about delays. School officials say it applies only to students who are drunk — not those who are actually sick.