(a) The sheriff may, with the approval of the commissioners court or, in the case of an emergency, with the approval of the county judge, employ a sufficient number of guards to ensure the safekeeping of prisoners and the security of a jail.
(b) In case of an emergency, a guard is subject to being called to duty by the sheriff.
(c) A person charged with the responsibility of enforcing this section commits an offense if the person violates the section. An offense under this section is a misdemeanor punishable by a fine of not less than $50 or more than $200.