A school suspension is not tied to any legal investigation. If a district beleives that a student is a threat to other students (and a police investigation is certainly evidence of threat) the district must, as a matter of practice, remove the student *immediately* or face additional lawsuits. The District would have no legal defense if the student under investigation were to harm another student.

Now, what they do with the student is another matter. They are still legally required to educate the student to the extent possible, and suspensions usually have a limit (3 to 5 days, IIRC). So, the districts which I taught him would have probably sent him to a campus for disruptive students, if one was available, or put him in a Behavioral Adjustment Class.

There is no provision in Title IX that requires a district to wait on any sort of police investigation before relegating a student to a special class, and there is no provision in Title IX that could remotely be interepreted as requiring a dangerous student to remain in the student body.