A survey of colleges and universities finds that many schools have gone years without investigating a sexual assault.

About 40 percent of respondents reported not having conducted a sexual assault investigation in the past five years. That includes 6 percent of the nation's largest public institutions.

The survey was conducted by the office of Sen. Claire McCaskill. The Missouri Democrat says federal law requires investigations when an incident is reported, and the number is alarmingly low.

The survey also finds that only about a quarter of respondents said there are written protocols between campus and local law enforcement on handling sexual assault cases.

McCaskill and other senators are considering legislation to address the issue.

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