Mich. Comp. Laws § 123.1403a

Sec. 3a. The prohibition in section 2(a) does not apply to a local government or law enforcement agency if that local government or law enforcement agency issues a request for proposals for operating a motor vehicle storage facility or towing operation and the request for proposals does not yield a bona fide bid. A local government or law enforcement agency shall use the standard or customary request for proposals process used by that local government or law enforcement agency for all other procurement matters when issuing the request for proposals for operating a motor vehicle storage facility or towing operation.