Re: Drone cannon
Also there is GPS navigation, so harder to jam that. Seriously, what would they do if you just launched a box of pills and hash cookies from a trebuchet into the prison yard? Or a homing pigeon loaded with contraband pr0n on microfiche? Holy crap, this sounds like a challenge to me!
The only real xyz-axis solution is that all prisoners shall be tied up with piano wire, then put into small, electric, cyclone-fence cages, while armies of fake drones drop decoy contraband upon the yard like leaves in autumn.