• plant DNA at a crime scene
• associate another's identity with his biometrics, thereby impersonating without arousing suspicion
• interfere with the interface between a biometric device and the host system, so that a "fail" message gets converted to a "pass"

There are also some concerns society has with biometrics:

• Physical - Some believe this technology can cause physical harm to an individual using the methods, or that instruments used are unsanitary. For example, there are concerns that retina scanners might not always be clean.
• Personal Information - There are concerns whether our personal information taken through biometric methods can be misused, tampered with, or sold, e.g. by criminals stealing, rearranging or copying the biometric data. Also, the data obtained using biometrics can be used in unauthorized ways without the individual's consent.

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