(2) The court shall not enforce an in terrorem clause if the beneficiary challenging the trust establishes that the beneficiary has probable cause to believe that the trust is a forgery or that the trust has been revoked.
(3) The court shall not enforce an in terrorem clause if the challenge is brought by a fiduciary acting on behalf of a protected person under the provisions of ORS chapter 125, a guardian ad litem appointed for a minor or a guardian ad litem appointed for an incapacitated or financially incapable person.
(4) For the purposes of this section, "in terrorem clause" means a provision in a trust that reduces or eliminates the interest of a beneficiary under the trust if the beneficiary challenges the validity of part or all of the trust. [2005 c.348 §38]