Head Boys/Girls are allowed to take House points away from other students in any House, including other prefects, and may also assign detention.<br/><br/>Head Boys and Girls also have special responsibilities whenever required. In 1993, when Sirius Black had broken into Hogwarts, Dumbledore asked the Head Boy and Head Girl to watch over the students in the Great Hall while he and the rest of the staff searched for Black in the castle.<br/><br/>They may also use the prefect's bathroom, and are not subject to curfew.