I see. I am fearful that if no concrete evidence is found that I could be accused of slander or libel. Still, I feel I have a responsibility to make the school board aware of this behavior. I will have to consider this further. Thank you for this information.
In a very short amount of time, a skilled attorney can go over your proposed report with you and assist you in avoiding any obvious perils for defamation (libel). You are not liable for libel just because no concrete evidence is found. You can be sued for libel only for untrue statements that cause damage. A carefully drafted report that sets forth matter known to you first-hand, without conclusions or judgments, should not make you civilly vulnerable, but assistance from a lawyer can be additional protection. Good luck to you.