Mich. Comp. Laws § 801.262: Prohibited acts; weapons.

Sec. 2.

Unless authorized by the chief administrator of the jail, a person shall not do either of the following:

Bring into a jail or a building appurtenant to a jail, or onto the grounds used for jail purposes, for the use or benefit of a prisoner, any weapon or other item that may be used to injure a prisoner or other person, or used to assist a prisoner in escaping from jail.

Sell or furnish to a prisoner, or dispose of in a manner that allows a prisoner access to the weapon or other item, any weapon or other item which may be used to injure a prisoner or other person, or used to assist a prisoner in escaping from jail.

Unless authorized by the chief administrator of the jail, a prisoner shall not possess or have under his or her control any weapon or other item that may be used to injure a prisoner or other person, or used to assist a prisoner in escaping from jail.