Mich. Comp. Laws § 720.655

Sec. 5. The board of trustees of the district may levy upon the approval of the electors of the district for the purposes heretofore specified, a tax of not more than 1 mill upon each dollar of the state equalized value of the property in each of the counties comprising the regional juvenile detention home area and, from time to time, may submit to the electors of the district at any state general election or county-wide primary election the question of additional assessment or tax for the operation of such homes.