I. On motion filed in connection with a petition for appointment of a guardian or on petition of a guardian if one has been appointed, the probate court shall consider whether the authority of an agent designated pursuant to an advance directive should be suspended or revoked. In making its determination, the probate court shall take into consideration the preferences of the principal as expressed in the advance directive. No such consideration shall change the procedures or burden of proof involved in the guardianship process as otherwise provided by law or procedures. In such consideration, the advance directive and agent appointed shall be presumed to be in the best interest of the principal and valid, absent clear and convincing evidence to the contrary.
II. To the extent that a durable power of attorney for health care, or such component of an advance directive as set forth in N.H. Rev. Stat. § 137-J:20, conflicts with a terminal care document or living will, or such component of an advance directive as set forth in N.H. Rev. Stat. § 137-J:20, the durable power of attorney for health care shall control.