V.A.M.S. 302.304; V.A.M.S. 577.600
When license is suspended or revoked ignition interlock is required to be maintained on all motor vehicles operated by the person for a period of not less than 6 months immediately following the date of reinstatement.
A court may require that any person who is found guilty of or pleads guilty to a first intoxication-related traffic offense, and a court shall require that any person who is found guilty of or pleads guilty to a second or subsequent intoxication-related traffic offense, shall not operate any motor vehicle unless that vehicle is equipped with a functioning, certified ignition interlock device for a period of not less than 6 months from the date of reinstatement of the person’s driver’s license.
