There is a new technology being tried out in Europe. It uses technology to detect homemade bomb-makers by sensing chemicals in the air and in sewers in urban areas. It is sponsored by the European Union.
According to an article on Fox Business, the technology works thus:
The sewer-based sensing system would use electrochemical water- and air-sampling to detect certain chemicals typically used for home-made bombs as they travel through the waste stream in urban areas.
. . .
“Terrorism and IEDs are never going away so we need to be able to screen people more effectively.”
Click on the image to enlarge.
One wonders whether the NSA isn’t already doing this in the US . . .