Can drones sniff explosives? I think that would be very expensive, they can have metal detectors, and mark suspicious sites for someone (or something, like a different digging drone) else to check.
But rats can sniff explosives and do so succesfully.
I don't know how it works for rats, but I assume it is like with dogs. If you have already a trained dog, you make the same exercises with the trained and the untrained dog, so the untrained dog can just watch what the trained dog does and imitate it.
But rats can sniff explosives and do so succesfully.
https://en.wikipedia.org/wiki/Magawa