This is the largest area of application of biometric technologies, and the most direct lineage to the feudal gate keeping system. Initially mainly used in military and other "high security" territories, physical access control by biometric technology is spreading into a much wider field of application. Biometric access control technologies are already being used in schools, supermarkets, hospitals and commercial centres, where the are used to manage the flow of personnel.
Biometric technologies are also used to control access to political territory, as in immigration (airports, Mexico-USA border crossing). In this case, they can be coupled with camera surveillance systems and artificial intelligence in order to identify potential suspects at unmanned border crossings. Examples of such uses in remote video inspection systems can be found at
A gate keeping system for airports relying on digital fingerprint and hand geometry is described at
An electronic reconstruction of feudal gate keeping capable of singling out high-risk travellers from the rest is already applied at various border crossing points in the USA. "All enrolees are compared against national lookout databases on a daily basis to ensure that individuals remain low risk". As a side benefit, the economy of time generated by the inspection system has meant that "drug seizures ... have increased since Inspectors are able to spend more time evaluating higher risk vehicles".
However, biometric access control can not only prevent people from gaining access on to a territory or building, they can also prevent them from getting out of buildings, as in the
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Other biometric technologies not specified here include ear recognition, signature dynamics, key stroke dynamics, vein pattern recognition, retinal scan, body odour recognition, and DNA recognition. These are technologies which are either in early stages of development or used in highly specialised and limited contexts.
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In palm recognition a 3-dimensional image of the hand is collected and compared to the stored sample. Palm recognition devices are cumbersome artefacts (unlike fingerprint and iris recognition devices) but can absorb perform a great amount of identification acts in a short time. They are therefore preferably installed in situations where a large number of people is identified, as in airports.
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In biometric technology, the subject is reduced to its physical and therefore inseparable properties. The subject is a subject in so far as it is objectified; that is, in so far as is identified with its own res extensa, Descartes' "extended thing". The subject exists in so far as it can be objectified, if it resists the objectification that comes with measurement, it is rejected or punished. Biometrics therefore provides the ultimate tool for control; in it, the dream of hermetic identity control seems to become a reality, a modern technological reconstruction of traditional identification techniques such as the handshake or the look into somebody's eyes.
The use of identification by states and other institutions of authority is evidently not simply a modern phenomenon. The ancient Babylonians and Chinese already made use of finger printing on clay to identify authors of documents, while the Romans already systematically compared handwritings.
Body measurement has long been used by the military. One of the first measures after entering the military is the identification and appropriation of the body measurements of a soldier. These measurements are filed and combined with other data and make up what today we would call the soldier's data body. With his data body being in possession of the authority, a soldier is no longer able freely socialise and is instead dependent on the disciplinary structure of the military institution. The soldier's social being in the world is defined by the military institution.
However, the military and civilian spheres of modern societies are no longer distinct entities. The very ambivalence of advanced technology (dual use technologies) has meant that "good" and "bad" uses of technology can no longer be clearly distinguished. The measurement of physical properties and the creation of data bodies in therefore no longer a military prerogative, it has become diffused into all areas of modern societies.
If the emancipatory potential of weak identities is to be of use, it is therefore necessary to know how biometric technologies work and what uses they are put to.
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Identity has to do with "place". In less mobile societies, the place where a person finds him/herself tells us something about his/her identity. In pre-industrial times, gatekeepers had the function to control access of people to particular places, i.e. the gatekeepers function was to identify people and then decide whether somebody's identity would allow that person to physically occupy another place - a town, a building, a vehicle, etc.
In modern societies, the unambiguous nature of place has been weakened. There is a great amount of physical mobility, and ever since the emergence and spread of electronic communication technologies there has been a "virtualisation" of places in what today we call "virtual space" (unlike place, space has been a virtual reality from the beginning, a mathematical formula) The question as to who one is no longer coupled to the physical abode. Highly mobile and virtualised social contexts require a new generation of gatekeepers which biometric technology aims to provide.
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The only biometric technology which does not measure the visual features of the human body. In voice recognition the sound vibrations of a person is measured and compared to an existing sample. The person to be identified is usually required to pronounce a designated password or phrase which facilitates the verification process. Voice recognition can be used on the phone, but has the weakness of technology is its susceptibility to interference by background noise.
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