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When did your son discover this new information?
It seems it may not be too late to sue because he has to sue within 2 years of discovering the claim.
I don't know if he can prove the school was negligent but it sure sounds like the doctor may have been.
His next step would be to consult with a lawyer as soon as possible, face to face. He should bring all the records he has with him to the consultation.
It may be better to see a medical malpractice lawyer.
You are very welcome.