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Long-range stand-off BW Agent detection system
Researchers at DSTL Porton Down have designed and built a prototype stand-off biodetection system based upon the principles of Light Detection and Ranging (LIDAR). It utilises an ultraviolet (UV) laser to detect, track and discriminate bio aerosol clouds at ranges of several kilometres by the collection and investigation of backscattered and induced fluorescent light from the target.
This could give us an idea of what the authorities are worried about, bio-aerosols. The tender was for a prototype to be built so this project must be fairly well advanced.
Since it scans in real-time, I did wonder if it was possible to team it up with some kind of anti-biological spray or sprinkler. Position anti-BW sprays around the city and if any nasties are detected by these things, the sprays in the affected areas go off. It might not eliminate the threat but it could diminsih it. (Don't know if it's possible though).