School contractors need to be in compliance with all CDL driver qualification requirements and regulations (FMCSR 391). It should be noted while there is an exemption for "to and from school" operation, there is no such exemption for trips performed by contractors. School transportation performed by a state or political subdivision of a state (i.e., municipalities) are exempt from some CDL requirements. For more information see FMCSR 390.3 (a), applicability, (f)(1)(2) exceptions (see interpretations for this section).
Agency of Transportation