There aren't just advantages, there is also some problems with fingerprint devices. First of all, people with dirty hands of working in an industry with a lot of manuel labor, the scanners may be unable to read a employees fingerprints as any devitaion will cause the system to not find the match in the database. Therefore, companies in the manufacturing industry, such inquire steadely before acquiring such a product. Also, it is possible to falsefy the system, as you don't need a perfect match but rather a depinct of the fingerprint. There in great national defence agencies, this would be a huge security breach, as a mold or a cast can sometimes be used to err the system. Finnaly, what does the public think of this. As many, view this as fine, many critics think this is a envasion of personal privacy, and you no longer use a PIN, but rather a body part. This is still in debate in some areas. Fingerprint devices are good, however, as mentionned before decding to impant, to should revise the industry you in and find out if it it well suited for this line of work.
Sources:
http://isaca.org/Template.cfm?Section=Home&CONTENTID=34319&TEMPLATE=/ContentManagement/ContentDisplay.cfm
http://www.itp.net/579712-biometric-device-can-sense-finger-veins
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