License required.

Mich. Comp. Laws § 333.18504, under PUBLIC HEALTH CODE.

Mich. Comp. Laws § 333.18504

Sec. 18504. (1) An individual shall not engage in the practice of social work at the bachelor's or master's level or use a title described in section 18503 unless licensed or otherwise allowed under this part. (2) The department shall issue a license or registration under this part for a duration of 3 years.