Mich. Comp. Laws § Article IV § 11: Legislators privileged from civil arrest and civil process; limitation; questioning for speech in either house prohibited.

Sec. 11.

Except as provided by law, senators and representatives shall be privileged from civil arrest and civil process during sessions of the legislature and for five days next before the commencement and after the termination thereof. They shall not be questioned in any other place for any speech in either house.