As with other privileges, the mediation privilege must have limits, and nearly all existing state mediation statutes provide them. Definitions and exceptions primarily are necessary to give appropriate weight to other valid justice system values, in addition to those already discussed in this Section. They often apply to situations that arise only rarely, but might produce grave injustice in that unusual case if not excepted from the privilege.

In this regard, the Drafters recognize that the credibility and integrity of the mediation process is almost always dependent upon the neutrality and the impartiality of the mediator. The provisions of this Act are not intended to provide the parties with an unwarranted means to bring mediators into the discovery or trial process to testify about matters that occurred during a court ordered or agreed mediation. There are of course exceptions and they are specifically provided for in Section 5(a)(1), (express waiver by the mediator) or pursuant to Section 6's narrow exceptions such as 6(b)(1), (felony). Contrary use of the provisions of this Act to involve mediators in the discovery or trial process would have a destructive effect on the mediation process and would not be in keeping with the intent and purpose of the Act.

Finally, these exceptions need not significantly hamper candor. Once the parties and mediators know the protections and limits, they can adjust their conduct accordingly. For example,