If you're just scanning for WiFi hotspots to see RID then you're not doing it correctly. By law (US at least) the drone must verify that RID is broadcasting before starting up the motors on every flight. RID is insanely inconsistent even if you're using the proper method for viewing it. It also depends on the manufacturer. Inspired Flight 1200a shows up on the Drone Scanner app constantly. So do DroneTag modules. DJI's are hit and miss and show up sporadically.