Advanced breath testing technology
Researchers are investigating methods to make breath test interlocks easier to use. One
company has developed a prototype hand­held breath test unit, about the size of a cigarette
package, using solid­state instead of fuel cell technology to measure breath alcohol.
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The breath
test unit is integrated into the remote key system that unlocks the car. To start the car, the driver 
presses a button on the breath test unit and blows into it. If the driver’s BAC is lower than the pre­ 
set level, the unit automatically sends a signal that unlocks the car’s ignition and the driver can
start the car. If the driver’s BAC is above the allowable level, the car will not start.
Tissue spectroscopy
Tissue spectroscopy uses infrared light to measure alcohol levels in the tissue just beneath the
the skin. While this technology has not yet been developed for use by drivers, in two methods 
currently being studied, a person places a forearm or a finger on a sensor pad.
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The sensors are
sufficiently accurate, so that they can detect both a person’s identity and the levels of certain
chemicals in the body, such as alcohol. This method of testing is both quicker and easier than
breath testing, as it requires a person only to touch a sensor.
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If very small devices could be
developed, they could be placed in the steering wheel where they could monitor driver alcohol
continually and unobtrusively.