Mo. Rev. Stat. § 577.600: Renting, leasing, or lending a vehicle to a person required to comply with ignition interlock requirements — penalty.

1. A person commits the offense of renting, leasing, or lending a vehicle to a person required to comply with ignition interlock requirements if he or she knowingly rents, leases, or lends a vehicle to a person required to use an ignition interlock device on all vehicles operated by the person unless the vehicle being rented, leased, or loaned is equipped with a functioning, certified ignition interlock device.

2. The offense of renting, leasing, or lending a vehicle to a person required to comply with ignition interlock requirements is a class A misdemeanor.