Michigan Compiled Laws, Chapter 52. Coroners § 52.111

Sec. 1. No person shall hereafter be eligible to serve as coroner or deputy coroner in and for counties having a population of 250,000 inhabitants and upwards who shall not be at the time of his election or appointment a physician or surgeon registered under the laws of the state of Michigan, and a graduate of a regularly incorporated medical college, and who shall not have practiced the profession of physician or surgeon for at least 5 years.