Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 556.031. Application to offenses committed before and after enactment

1. The provisions of this code shall govern the construction and punishment for any offense defined in this code and committed after January 1, 1979, as well as the construction and application of any defense to a prosecution for such an offense.

2. Offenses defined outside of this code and not repealed shall remain in effect, but unless otherwise expressly provided or unless the context otherwise requires, the provisions of this code shall govern the construction of any such offenses committed after January 1, 1979, as well as the construction and application of any defense to a prosecution for such offenses.

3. The provisions of this code do not apply to or govern the construction of and punishment for any offense committed prior to January 1, 1979, or the construction and application of any defense to a prosecution for such an offense. Such an offense must be construed and punished according to the provisions of law existing at the time of the commission thereof in the same manner as if this code had not been enacted, the provisions of section 1.160 notwithstanding.