Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.852

Sec. 852. (1) A petition, inventory, accounting, proof of claim or proof of service filed with the probate court need not be verified, acknowledged or made on oath if the person signing the instrument states immediately above the date and his signature: “I declare under the penalties of perjury that this _____ was examined by me and that the contents thereof are true to the best of my information, knowledge and belief.” This provision shall not apply to nominations of guardians by minors.

(2) A person who falsely executes and files with the probate court as provided in this section an instrument containing a declaration under the penalty of perjury may be found guilty of contempt of court and punished therefor and shall in addition be subject to the same responsibilities, liabilities, and penalties as he would have been if he had executed the instrument under oath.