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.
The flying ones can use thermal cameras. The mines and surrounding areas change temperature differently.
Then the ground ones do the actual demining.
> He spent a number of weeks mentoring 20 newly-recruited rats
How does that work for a rat? Sounds interesting.