Michigan is not a stop and ID state, so police officers cannot just demand ID and detain people if they are doing nothing wrong for the purposes of just checking IDs.
However, when it comes to college campuses be vary careful. If you are dealing with a city, county, or state officer, the above would apply. If you are dealing with campus police, they are usually certified officers with the ADDITIONAL authority to enforce campus policies as well. If your college has a policy to ID yourself to staff anytime they see fit, the officer could submit a report that you failed to comply with his commands which in turn the college could take disciplinary action against you. Before challenging a campus officer I would make sure you know all your school policies inside and out.
On the other hand, if you are just visiting the campus, follow the wash, rinse and repeat advice as listed in the top of this form.