Mississippi Code Title 19. Counties and County Officers § 19-5-43

The boards of supervisors in their respective counties shall temporarily provide for the care and maintenance of any person alleged to have mental illness when the person has no means of paying that expense, pending an investigation into the mental status of the person alleged to have mental illness before the chancery clerk of the county, and provide for the care and maintenance of those persons by the sheriff of their respective counties after being adjudged as a person with mental illness by the properly constituted authority, when there is no room in one (1) of the state psychiatric hospitals or institutions for the person with mental illness. The boards shall cause all reasonable and proper allowance for that care and maintenance to be paid out of the county treasury.