Police may stop publicly-owned school district bus to ascertain whether its use is authorized by law.

Miss. Code Ann. § 37-41-45
in effect
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It shall be a misdemeanor for any person to use a publicly owned school district bus for any purpose other than one in connection with the school, and, upon conviction thereof, such person shall be fined not less than Fifty Dollars ($50.00). When any publicly owned school district bus is being operated on the public roads or highways at a time other than the usual and customary time for the transportation of children to and from the public schools, members of the Highway Safety Patrol, sheriffs, constables and other peace officers shall have the power and authority to stop such bus for the purpose of ascertaining whether the trip then being made is authorized by law. If it be found that such trip is unauthorized, such highway patrolman, sheriff, constable or other peace or police officer shall forthwith report the same to the school board owning such bus and to the State Department of Education.

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