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I am afraid that before you could sue the school or the principal personally, what you have to do is prove that the CPS report was false. The principal's motives from making the report only become important if you prove the allegations she made were false, since she is a mandatory reporter.
There are quite a few civil rights and general litigation attorneys who will take on the principal for making a false allegation of abuse. However, again, you have to prove that the allegations were false.
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