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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Actually, modern cameras can detect and measure human irises at quite a distance. It’s just, the cameras needed to do so are prohibitively expensive for mass deployment as security cameras ar your local Starbucks.
But, iris databases are a form of advanced biometrics, and they’re basically impossible to destroy or alter without blinding yourself. It makes it possible to be absolutely sure a person who’s previously been arrested and processed in the database can not conceal their criminal record by changing their name or lying to police about their identity
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.
They could also be used for identification of a suspect who is currently in custody and has a criminal record from a previous incident, even if the suspect has changed his appearance with plastic surgery and burnt off his fingerprints.
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