Major disadvantages of implementing the biometric devices are that it is very expensive and can affect the ability depending on the usage and the surrounding. For example, if we take the fingerprint as the password would be that fingerprints of a person keep changing from time to time, therefore the device have problem identifying it. The fingerprints of people working in Chemical industries are often affected and should no use it a mode of authentication. Iris scanner has difficulty capturing the iris of some individuals, which is the major disadvantage. It can be easily covered with “eyelashes, contact lenses, eyelids or even reflections from the cornea”. It is not that widely used but scanning your eyes with a light source can also be dangerous. Face detection is also a popular biometric device for security purposes. The most important disadvantage of the device is that the face can easily be disguised or even obstructed by hair, glasses, hats etc. It is very sensitive and reduces the reliability of the security level.
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