Tennessee Code Title 33. Mental Health and Substance Abuse and Intellectual and Developmental Disabilities § 33-9-102

(1) The person was under detention by law in a facility as a mentally ill person;

(2) The person had been previously determined by legal proceedings to be mentally ill, the finding being unreversed and in full force and effect, and the control of the person having been acquired by a court of competent jurisdiction of the state from which the person fled; or

(3) The person was subject to detention in the state, being then the person's legal domicile, personal service of process having been made, based on legal proceedings pending there to have the person declared mentally ill.