You can use unmanned flying drones from DJI, but you still need a thermal imager for it, thermal imagers are not cheap. It is easier for you to order such services on a one-time basis.
Drug and Alcohol Testing Association of Canada
You can use unmanned flying drones from DJI, but you still need a thermal imager for it, thermal imagers are not cheap. It is easier for you to order such services on a one-time basis.