Michigan Compiled Laws, Chapter 3. Federal and Interstate Relations § 3.454

Sec. 4. The jurisdiction of the lands and water area described in section 1 1 is ceded to the United States of America upon the express condition that the state of Michigan shall retain concurrent jurisdiction, both civil and criminal, over persons on the lands and water area, so that all civil and criminal process issued by any court of competent jurisdiction or officer having authority of law to issue process and all orders made by the court, or any judicial officer authorized to make the orders necessary to be served upon any person, may be executed upon the lands and water area in the same manner as if jurisdiction had not been ceded.