Re: Possible detection
For a device that is operating autonomously more destructive options exist including the HPEM source from Diehl
So.. alternatives could be a police attack drone fitted with a taser. If the <zap> didn't kill it, getting it tangled in the wires might down it. Or the drone (or helicopter) could have other non/less lethal and commercially available choices. Like beanbag rounds, net launchers, sticky-web launchers. Or for a cheap option, that trip-wire detecting favorite, cans of silly string to gum up the target.