Unlike colleges and universities, there are no national requirements for U.S. elementary and secondary schools to track student sexual assaults. But 32 states and the District of Columbia do maintain information, though it is inconsistent and sometimes incomplete, The Associated Press found.

Some states required school districts to log any student sexual assault on school property or at school-sponsored events, but others required reporting of only those assaults resulting in certain types of student discipline. In Michigan, for example, the state counted only expulsions. So one Lansing high s...