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For example, a breathalyzer measurement of 0.10 mg/L of breath alcohol characterises approximately 0.0001×2251 g/L, or 0.2251 g/L of arterial blood alcohol concentration (equivalent to 0.2251 permille or 0.02251% BAC). [16] The ratio of venous blood alcohol content to breath alcohol content may vary significantly, from 1300:1 to 3100:1.
Hair drug testing is a method that can detect drug use over a much longer period of time than saliva, sweat or urine tests. Hair testing is also more robust with respect to tempering. Thus, hair sampling is preferred by the US military [66] and by many large corporations, which are subject to Drug-Free Workplace Act of 1988.
In 1954 Borkenstein created what is commonly known as the Breathalyzer. This version was a more compact, and easier to operate breath test machine, which produced reliable results concerning blood alcohol content. [2]
More available drug tests using urine, saliva and hair can detect THC in the body for several days, weeks and even months. Yet, for those workplaces who do test for marijuana, positivity rates are ...
Alcohol levels within the body are usually detected through blood or breath. The best way to identify endogenous ethanol in the bloodstream is through gas chromatography. In gas chromatography the breath or blood is heated so that the different components of the vapor or blood separate. The volatile compounds then pass through a chromatograph ...
DUI and alcohol-related crashes produce an estimated US$45 billion in damages every year. [ 3 ] With alcohol, a drunk driver 's level of intoxication is typically determined by a measurement of blood alcohol content or BAC; but this can also be expressed as a breath test measurement, often referred to as a BrAC.
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