Not sure that would be practical. Sending them out to banks would increase the danger of flawed notes hitting the streets.
I don't think it would be that difficult for someone to construct a scanner that can rapidly detect the flaw, after all they have machines that shine lights through hens eggs to detect any that have been fertilised, and they can scan thousands of eggs a minute.
Mind you they have 1.1 billion notes to scan, so it'll still take a while
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