Me. Rev. Stat. tit. 18-C, § 8-204

Except as otherwise provided by sections 3‑603 to 3‑606, 4‑204, 4‑207, 5‑125, 5‑415 and 5‑416 and Title 18‑B, section 702, a bond required to be given to the State of Maine or the court or to be filed in the probate office is insufficient until it has been examined by the court and approved by the court in writing.