the weakest links in civ drones are the RF interface - GPS, telemetry and command links - and run time or battery life.
you could jam the command interface - use a scanner or spectrum analyzer to find it and a transmitter via signal generator and linear amplifier to blind it or drop it. if the drone is pre-programmed and you cant drop it - blind its real time telemetry.
a more permanent solution;
using visual - those engines get warm and leave a heat signature. NVG of varying types should work.*high cost
using acoustics - multiple LP's should be able to triangulate. - this is good for finding snipers in an SHTF.#low cost
using RF - a yagi antenna mounted on a pistol grip is old but reliable tech.#low cost if set up for ham comms.
using logic - if you live in a wooded location - figure out where an operator can land a drone close to its detection location.#low cost if on home ground
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>:D follow the drone back to the operator. Have a polite chat about privacy. @priceless
re: registration, the WHY question.
Politicians covet the sole use of force to be available only to their minions. Because drones are a force multiplier, hence the regulations for registration. Similarly to the regulations prohibiting encryption on the ham bands....
Massa don like his slaves a whisperin an he especially don like them able to fight back....
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