On Mon, 03 Jul 2000, you wrote:
> >One day 5 or 6 Black helicopters landed, complete with
> >guys in flack vests and carrying machine guns. After securing the area,
> >they took a good look around, and discovered that the only marijuana was
> >in a small 4' by 3' patch out in the open.
> Are they picking up a chemical or spectral signature by some sort of
> coarse-grained remote sensing technology, maybe from orbit?
I have heard that they use some type of IR spectroscopy from high-flying
aircraft. Apparently this allows them to sweep large regions for
suspicious growths. I do not know if this is true, but since I do know
that it is possible to identify some types of plants by their IR spectra,
this is a plausible explanation.
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