Mich. Comp. Laws § 205.66a
It shall be the duty of each assessing officer of each city, village or township in preparing the annual property tax roll of personal property to show on the assessment roll the sales tax license number of each person engaged in the business of making retail sales of tangible personal property subject to tax under this act. It shall be the duty of each said assessing officer to immediately report to the department of revenue the name and address and type of business of any person found in the business of making such retail sales and not licensed to do so as required by section 3 of this act.
Any city, village or township clerk, marketmaster, or any other state, county or municipal official whose duty it is to issue licenses or permits to engage in a business involving the sale at retail of tangible personal property subject to tax under this act shall, before issuing such license or permit, require proof that the person to whom such license or permit is to be issued is the holder of a sales tax license as required by section 3 of this act or has applied to the department of revenue for such license.
Any city, village, township or state officer who shall receive information which leads him to believe that a person making retail sales subject to tax under this act is about to close his business or cease making retail sales shall immediately notify the department of revenue of this fact in order that the department may make such investigation as may be necessary to protect the interests of the state.
MCL 205.66a