Mich. Comp. Laws § 750.222a: “Double-edged, nonfolding stabbing instrument” defined.

Sec. 222a.

As used in this chapter, "doubled-edged, nonfolding stabbing instrument" does not include a knife, tool, implement, arrowhead, or artifact manufactured from stone by means of conchoidal fracturing.

Subsection (1) does not apply to an item being transported in a vehicle, unless the item is in a container and inaccessible to the driver.