The Supreme Court's landmark ruling overturning Washington, D.C.'s handgun ban could have implications for colleges that prohibit firearms on their campuses. Last month the court declared for the first time that the U.S. Constitution's Second Amendment protects an individual's right to keep a gun, not just the right of states to maintain armed militias. But the ruling preserved restrictions on Second Amendment rights that allow schools, courts, and other government entities to ban weapons on their premises. But some lawyers expect lawsuits from gun-rights advocates based on the ruling. A major question, says Robert L. Clayton, a lawyer who specializes in higher education, is the definition of the word "school," which in academic parlance usually refers only to elementary and secondary institutions.