(a) The commissioners court of a county may employ one or more registered nurses to visit the public schools in the county.
(b) A nurse employed under Subsection (a) shall:
(1) investigate the health conditions and sanitary surroundings of the schools and the personal, physical, and health condition of students in the schools;
(2) cooperate with the department and local health authorities; and
(3) perform other duties required by the commissioners court.