Mo. Rev. Stat. § 562.011: Voluntary act.

1. A person is not guilty of an offense unless his or her liability is based on conduct which includes a voluntary act.

2. A "voluntary act" is:

(1) A bodily movement performed while conscious as a result of effort or determination; or

(2) An omission to perform an act of which the actor is physically capable.

3. Possession is a voluntary act if the possessor knowingly procures or receives the thing possessed, or having acquired control of it was aware of his or her control for a sufficient time to have enabled him or her to dispose of it or terminate his or her control.

4. A person is not guilty of an offense based solely upon an omission to perform an act unless the law defining the offense expressly so provides, or a duty to perform the omitted act is otherwise imposed by law.