Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.242a

Sec. 242a. No person shall regroove or recut motor vehicle or motorcycle tires or knowingly sell, offer or expose for sale or have in his possession with intent to sell any motor vehicle or motorcycle tire or any motor vehicle or motorcycle equipped with one or more tires which have been recut or regrooved, except that there shall be no prohibition against the regrooving or recutting of commercial vehicle tires or the sale of regrooved or recut commercial vehicle tires or commercial vehicles equipped with such commercial vehicle tires which are designed and constructed in such a manner that regrooving or recutting is an acceptable and safe practice. A violation of this section shall constitute a misdemeanor.