missouri 559.021 (3.) The defendant may refuse probation conditioned on the performance of free work. If he does so, the court shall decide the extent or duration of sentence or other disposition to be imposed and render judgment accordingly. Any county, city, person, organization, or agency, or employee of a county, city, organization or agency charged with the supervision of such free work or who benefits from its performance shall be immune from any suit by the defendant or any person deriving a cause of action from him if such cause of action arises from such supervision of performance, except for an intentional tort or gross negligence. The services performed by the defendant shall not be deemed employment within the meaning of the provisions of chapter 288, RSMo. A defendant performing services pursuant to this section shall not be deemed an employee within the meaning of the provisions of chapter 287, RSMo.
That dont sound like incarseration, slavery maybe but not incarseration