scibri writes "The iris scanners that are used to police immigration in some countries, like the UK, are based on the premise that your irises don't change over your lifetime. But it seems that assumption is wrong. Researchers from the University of Notre Dame have found that irises do indeed change over time, enough so that the failure rate jumps by 153% over three years. While that means a rise from just 1 in 2 million to 2.5 in two million, imagine how that will affect a system like India's — which already has 200 million people enrolled — over 10 years."
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