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How about requiring a POV (persistence of vision) display on such a drone? At a cost of few additional LEDs (or even not, if you reuse onboard ones) and some CPU cycles you could have the drone flash its serial number in a way visible on cameras as the drone moves around.

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That's still a large amount of weight to carry on a device.

There are 250 class quadcopters that are built for First Person View racing. Races are won and lost because of the difference in a few grams of extra weight.

Any extra weight you add to a device reduces the flight time of the battery.

I think that quadcopters used for FPV racing generally don't appear in the areas where drone identification would be a need.

I agree, but others may not... White House lawn anyone?

Because of those others we have this problem in the first place.

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