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1) If you have personal knowledge of abuse that was not prosecuted or pursued by the victims, there is no law against you divulging truthful information about someone that you have knowledge of as that would not be considered defamation.
2) There is no law for the school to maintain personnel records from that long ago and there is no continuing duty to disclose the information I am afraid and the schools many times do not want to get involved in disputes, especially where his criminal conviction record is a permanent record and that can be checked by any prospective employers and his history can be discovered without the school getting involved.
3) All personnel records can be considered confidential by the employer and do not have to be disclosed. The reasons for his termination are personnel decisions that are not mandated to be disclosed to anyone, so the attorney could have prevented them from disclosing any information about any employee, past or prospective. The child abuse laws do not make provisions to circumvent that I am afraid. Again, he has a criminal record which is a permanent record and all educational facilities are supposed to by law make criminal records checks which would uncover his prior criminal charges and prevent him from working with children by state laws.
4) Schools are simply not required to maintain the records and report (other than to law enforcement as mandatory reported) to the general public any information about the employees including sexual offenses. This is something, again, that is available based on criminal records and as he was arrested there is indeed a public record of his conviction and his charges and in every state to work with children or elderly you cannot have any criminal history of such abuse and that is the protection available to the general public. However, it is not up to the schools or churches to continue to report personnel actions, even if they were for abuse (which is why you see the issues with the Catholic church not reporting reasons for a priest being transferred after a sexual abuse charge, as it is not illegal for them to not report).
You are up against the confidentiality of employee records beyond the school's mandatory reporting to law enforcement responsibilities and this would require a legislative change, which even in light of all of the Catholic church cases has not been changed by state legislatures as they rely on the criminal records of anyone convicted to provide protection of children while balancing the rights of the individual from having confidential personnel information disclosed.
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