http://www.newsmax.com/US/immigrants-biometric-tracking/2012/03/06/id/431655
The Department of Homeland Security is finalizing its plan for a biometric data system to track when immigrants leave the United States and will present it to Congress within “weeks,” a top department official told a House Homeland Security subcommittee Tuesday.
An exit system to track who is leaving the country and when has been sought since before the Sept. 11 terrorist attacks. DHS officials, including Secretary Janet Napolitano, have agreed with the need for such a program but have previously said it would be too costly.
...Biometric identifiers are the distinctive, measurable characteristics used to identify individuals.[1] The two categories of biometric identifiers include physiological and behavioral characteristics.[2] Physiological characteristics are related to the shape of the body, and include but are not limited to: fingerprint, face recognition, DNA, palm print, hand geometry, iris recognition (which has largely replaced retina), and odour/scent. Behavioral characteristics are related to the behavior of a person, including but not limited to: typing rhythm, gait, and voice.[note 2] Some researchers have coined the term behaviometrics to describe the latter class of biometrics
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