Alright I dont know if this has been mentioned or not , because I took such fast time to scan the thread. I dont know of this ADF but I do know of another solution to stopping the cops. If you purchase some drywall for your roof , search for some with lead in it, infa red cant see threw lead, it just bounces back. Ive seen one of my friends do this and there's usually a chopper around the area frequently.