When child transportation is conducted to or from: The center by the center operator, there shall be at least one adult, who has successfully passed federal and State criminal background checks and a review of child and adult abuse and neglect records pursuant to COMAR 13A.16.07.06D, other than the driver present in the vehicle if: More than eight preschoolers are being transported as a group; or At least one child is being transported and the driver of the vehicle is not: A center employee; or The parent of a child in care who is authorized by the operator to assist in transporting children in care; or An off-site activity by an independent contractor or a local school district and at least one child in care is being transported, the center operator shall ensure that there is at least one adult other than the driver present in the vehicle.