(a) No person may work in a public school unsupervised with students without a valid permit, a license issued under this chapter, or an approved professional license issued under Title 24.
(b) The following individuals are exempt from the requirements of subsection (a) of this section:
(1) Noninstructional administrators.
(2) Nutrition staff.
(3) Custodial staff.
(4) Transportation staff.
(5) Clerical staff.
(6) A charter school administrator exempt under § 507(c) of this title.
(7) A substitute teacher serving for less than 12 consecutive weeks in 1 school.