Who cares about expulsion, why not call the cops, get him arrested, tried, and convicted.?
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Can’t.
The way this works is that this is a college concern. Colleges and universities have their own police force. Even if the alledged rape happened off campus, the city cops dump it down to the campus cops.
Campus cops investigate and determine no rape actually occured, and case closed.
Some may try and get the County DA to press charges, but since the campus cops closed ther books, then....
Nothing happens.
Gotta change.
Depends on the university. For example, at The Ohio State University, the Ohio Highway Patrol aka State Police also has jurisdiction and can override campus police.
Not sure what the situation is at Columbia...