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23 Jul
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Posted by Mollo Law Firm
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Breath testing machines are commonly used to estimate a person’s blood alcohol concentration (BAC) before an arrest. New Jersey law enforcement officers typically use an Intoxilyzer 5000, which is a particular brand of breath-testing machine.
In the Intoxilyzer:
–> A lamp generates a broadband (multiple-wavelength) IR beam.
The broadband IR beam passes through the sample chamber and is focused by a lens onto a spinning filter wheel.
–> The filter wheel contains narrow band filters specific for the wavelengths of the bonds in ethanol. The light passing through each filter is detected by the photocell, where it is converted to an electrical pulse.
–> The electrical pulse is relayed to the microprocessor, which interprets the pulses and calculates the BAC based on the absorption of infrared light.
All breath testing machines work on the principle that alcohol, once it’s ingested, enters the bloodstream through the walls of the digestive tract. Once it’s there, the alcohol travels with the blood throughout the body, including into the lungs, where the blood drops off carbon dioxide and picks up oxygen as you breathe. Some of the alcohol in your blood leaves the body as you breathe out, along with the carbon dioxide.
The Intoxilyzer uses infrared (IR) spectroscopy to sense the number of alcohol molecules in a breath sample. Since alcohol molecules have a different weight and shape than carbon dioxide or any other molecule in human breath, the IR spectroscope inside the Intoxilyzer machine can be calibrated to “see” these molecules while ignoring others in the sample. The machine then measures the number of alcohol molecules it “sees” against the total sample size to determine what percentage of the sample is alcohol. This number estimates the percentage of the test-taker’s blood that is alcohol. A person with a BAC percentage of 0.08 or higher is prohibited from driving under New Jersey law.
The Intoxilyzer is a piece of precision equipment that must be calibrated, tested, and maintained regularly in order to give accurate test results. If you have been charged with drunk driving in New Jersey, the experienced New Jersey DUI lawyers at Mollo Law Firm, can help you build an aggressive defense that fights for the best possible outcome in your case. For a FREE confidential consultation, call us today at 732-747-1844.
| Category: DWI Law | Tag: Al Mollo Esq., BAC, DUI, DWI, intoxicated drivers, Intoxilyzer, Mollo Law Firm, New Jersey DUI attorney, NJ, Red Bank |




