Michigan Compiled Laws, Chapter 380. School Code of 1976 § 380.1313

Sec. 1313. (1) If a dangerous weapon is found in the possession of a pupil while the pupil is in attendance at school or a school activity or while the pupil is enroute to or from school on a school bus, the superintendent of the school district or intermediate school district, or his or her designee, immediately shall report that finding to the pupil's parent or legal guardian and the local law enforcement agency.

(2) If a school official finds that a dangerous weapon is in the possession of a pupil as described in subsection (1), the school official may confiscate the dangerous weapon or shall request a law enforcement agency to respond as soon as possible and to confiscate the dangerous weapon. If a school official confiscates a dangerous weapon under this subsection, the school official shall give the dangerous weapon to a law enforcement agency and shall not release the dangerous weapon to any other person, including the legal owner of the dangerous weapon. A school official who complies in good faith with this section is not civilly or criminally liable for that compliance.

(3) A law enforcement agency that takes possession of a dangerous weapon under subsection (2) shall check all available local and state stolen weapon and stolen property files and the national crime information center stolen gun and property files to determine the legal owner of the dangerous weapon. If the dangerous weapon is a pistol, the law enforcement agency also shall check the state pistol registration records to determine the legal owner. If the law enforcement agency is able to determine the legal owner of the dangerous weapon, and if the legal owner did not knowingly provide the dangerous weapon to the pupil or lawfully provided the dangerous weapon to the pupil but did not know or have reason to know that the pupil would possess the dangerous weapon while in attendance at school or a school activity or while en route to or from school on a school bus, the law enforcement agency shall send by certified mail to the legal owner a notice that the agency is in possession of the dangerous weapon and that the legal owner has 90 days from receipt of the notice to claim the dangerous weapon.

(4) As used in this section, “dangerous weapon” means a firearm, dagger, dirk, stiletto, knife with a blade over 3 inches in length, pocket knife opened by a mechanical device, iron bar, or brass knuckles.