HB 113 -- Leaving a Child in a Motor Vehicle Sponsor: Threlkeld This bill creates the crime of leaving a child unattended in a motor vehicle in the third degree. The offense is committed when a child 10 years of age or younger is left unattended in a motor vehicle and the child's health or safety is at risk, the engine is running, or the keys are anywhere in the passenger compartment of the vehicle. The offense will be a class C misdemeanor.Copyright (c) Missouri House of Representatives