Penal labor in the United States, when intended as a form of slavery or involuntary servitude, is explicitly allowed by the 13th Amendment of the U.S. Constitution. This form of legal slavery is only allowed when used as punishment for committing a crime. The 13th Amendment states that "neither slavery nor involuntary servitude, except as a punishment for a crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction." Unconvicted detainees awaiting trial cannot be forced to participate in forced rehabilitative labor programs in prison as it violates the Thirteenth Amendment.