Mo. Rev. Stat. § 300.120: When driver unable to report.

1. Whenever the driver of a vehicle is physically incapable of giving immediate notice of an accident as required in section 300.110 and there was another occupant in the vehicle at the time of the accident capable of doing so, such occupant shall give, or cause to be given, the notice not given by the driver.

2. Whenever the driver is physically incapable of making a written report of an accident as required in section 300.115 and such driver is not the owner of the vehicle, then the owner of the vehicle involved in such accident shall within five days after the accident make such report not made by the driver.