Michigan Compiled Laws, Chapter 556. Powers of Appointment § 556.205

Sec. 105. (1) To be effective, a power of attorney created on or after the effective date of this act must be signed by 1 of the following individuals:

(2) To be durable, a power of attorney signed under subsection (1)(a) must meet 1 of the following requirements:

(3) To be durable, a power of attorney signed under subsection (1)(b) must be signed in the presence of 2 witnesses as described in subsection (2)(b), regardless of whether the power is acknowledged.

(4) A signature on a power of attorney is presumed to be genuine if the principal acknowledges the signature before a notary public or other individual authorized by law to take acknowledgments.

(5) A signature on a power of attorney that is witnessed as described in subsection (2)(b) but is not acknowledged by the principal before a notary public or other individual authorized by law to take acknowledgments is not entitled to the presumption of genuineness under subsection (4), and the power is not acknowledged within the meaning of sections 119 and 120.  1