The law covers apps too in the section
"with any radio equipment or combination of equipment, capable of receiving any radio signal, message, or information from any police emergency frequency, "
Subdivision 1.Use regulated. (a) No person other than peace officers within the state, the members of the State Patrol, and persons who hold an amateur radio license issued by the Federal Communications Commission, shall equip any motor vehicle with any radio equipment or combination of equipment, capable of receiving any radio signal, message, or information from any police emergency frequency, or install, use, or possess the equipment in a motor vehicle without permission from the superintendent of the bureau upon a form prescribed by the superintendent