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:
Shadow Analysis Could Spot Terrorists
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Posted 2008-09-21, 02:56 AM in reply to
WetWired
's post starting
"It couldn't work through..."
WetWired said:
[Goto]
It couldn't work through non-transparent substances
because it's watching your
shadow
, which is defined by the
visible light
arround it
.
The sun isn't positionally static, so I'd assume it could use other light sources to a limited degree as well. /shrug
Also, a lot of my previous post was just idle speculation on how it would work.
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