Officially they are for finding criminals, but how? Fingerprints could be left behind at a crime seen, but how could iris patterns be left behind? Modern day security cameras are not clear enough to capture irises right?
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It’s not really for evidence reasons, but identification.
Think someone buying fake papers to sneak into another country. Customs can use iris scans for identification.
It’s usually federal level stuff. It’s far to expensive for local or regional use.
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