The governing board of any school district may:
- (a) Exempt the district or any school or class of schools in the district from the operation of this chapter.
- (b) Make exceptions to Section 627.2 for particular classes of outsiders.
- (c) Authorize principals to exempt individual outsiders from the operation of Section 627.2; but any such exemption shall be in a writing which is signed and dated by the principal and which specifies the person or persons exempted and the date on which the exemption will expire.
- (d) Exempt, or authorize principals to exempt, designated portions of school grounds from the operation of this chapter during some or all school hours.