Missouri’s "Truth in Sentencing" Law

558.091.3. Minimum Prison Terms

Other provisions of the law to the contrary notwithstanding, any defendant who has pleaded guilty to or has been found guilty of a dangerous felony as defined in section 556.061, RSMo, and is committed to the department of corrections shall be required to serve a minimum prison term of eighty-five percent of the sentence imposed by the court or until the defendant attains seventy years of age, and has served at least forty percent of the sentence imposed, whichever occurs first.

556.061. Code Definitions

(8) "Dangerous felony" means the felonies of arson in the first degree, assault in the first degree, forcible rape, forcible sodomy, kidnapping, murder in the second degree and robbery in the first degree.