Section 573 - Hours on Duty(a) Patrol members shall reach their posts at least 15 minutes before the opening of classes in the morning and in the afternoon, or at such earlier time as the governing board shall authorize, and shall remain on duty until the last bell calls the pupils to class.(b) At dismissals, patrol members shall leave their classes in time to reach their posts before the dismissal bell.(c) At dismissals, each patrol member shall remain on duty until all students who are not stragglers have passed his post.Cal. Code Regs. Tit. 5, § 573