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This is a background to biometrics technologies for those that are fairly new to the subject. There is always hype around emerging technologies — biometrics is no exception. Often those with the loudest voices have major interests in seeing it adopted. This is no surprise, but it can give a distorted picture of what something actually does (i.e. ‘it solves all your problems’) and whether it actually fits the requirements.
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Piers Wilson (2002) studied this question.
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