According to the Mediator Ethics Advisory Committee’s most recently published opinion, the answer is “[t]here is no ethical obligation under the Florida Rules for Certified and Court-Appointed Mediators for a mediator to report allegations of ethical violations by another mediator.” You will want to read MEAC Opinion 2005-004. It also opines that “[i]t is inappropriate for a mediator to represent either one party or both parties in any dissolution proceeding or in any matter arising out of the subject mediation.”
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