(a) The Texas Commission on Law Enforcement shall develop and the commission shall approve an examination for a person assigned to the jail administrator position overseeing a county jail.
(b) The commission shall adopt rules requiring a person, other than a sheriff, assigned to the jail administrator position overseeing a county jail to pass the examination not later than the 180th day after the date the person is assigned to that position. The rules must provide that a person who fails the examination may be immediately removed from the position and may not be reinstated until the person passes the examination.
(c) The sheriff of a county shall perform the duties of the jail administrator position at any time there is not a person available who satisfies the examination requirements of this section.
(d) A person other than a sheriff may not serve in the jail administrator position of a county jail unless the person satisfies the examination requirement of this section.