When handling a serious student discipline problem on the bus, what does the AAMVA CDL Manual list as the first recommended tip?

AAMVA CDL Manual, Section 10.5.2 (Handling Serious Problems), p. 10-8; 49 CFR Part 380, Appendix D, Unit D1.7 (Student Management)

Following established school district discipline procedures first, before taking independent action like stopping the bus or calling police, keeps the driver's response consistent with the district's own policy and avoids improvising in a situation the school may already have a protocol for.