Photos of the aircraft reveal the spray nozzles mounted below the wing trailing edge. These companies and pilots could be prosecuted if there was political will to do so. Instead, they are being protected.
https://www.flightaware.com/resources/registration/N7199S
N7199S (1972 BEECH 65-A90-4 owned by DYNAMIC AVLEASE INC) Aircraft Registration - FlightAware
N7199S (1972 BEECH 65-A90-4 owned by DYNAMIC AVLEASE INC) aircraft registration information with aircraft photos, flight tracking, and maps.
https://www.flightaware.com/resources/registration/N7199S