There are several different methods available for alcohol testing. Alcohol can be tested in the blood, breath, urine and saliva.Blood Alcohol Concentration (BAC) is considered to be the standard for measuring the degree to which an individual is impaired by alcohol. For years, studies have shown that there is a direct correlation between the blood alcohol concentration and the degree to which reactions and judgments are impaired. The methodology used for blood alcohol testing is Gas Chromatography and is the most accurate forensic quality test in the industry today. However, drawing blood is an invasive and expensive procedure that most companies prefer to avoid เหล้านอก.
It is well proven that there is a direct correlation between the blood alcohol concentration of a person and their breath alcohol contents. During respiration, gas is exchanged from the lungs to the blood (primarily oxygen) during inhalation, and visa versa (primarily C02) during exhalation. During this exchange, alcohol in the blood vaporizes and is carried out of the lungs in the exhaled breath. There are several types of breath alcohol testers available today. These range from disposable screening testers to the equipment that provides legally admissible results, including very expensive digital read-out breath alcohol monitors. These types of testers fall into three categories:
The disposable devices are noninvasive, less accurate and non scalable methods of screening for alcohol. Can be used to detect the presence of alcohol with a rough estimate to the degree of impairment. Being disposable, the cost per test for preliminary screening is considerably higher than the cost of testing using portable devices.Here is how they work The ethyl alcohol in the blood escapes through the lung tissue into the exhaled breath.
The presence of ethyl alcohol in the breath is detectable by a color change of very sensitive chemically coated crystals contained in the Disposable Breath Analyzer. Immediately prior to use, the ampoule is ruptured by slight finger pressure on the outer flexible clear tube to release crystals within the confines of the tube. When the subject exhales into the tube, crystals interact with breath vapor and change color from yellow to blue if alcohol is present. If all the crystals change color completely, this indicates that the blood alcohol level of the subject is over 0.10%, exceeding the legal limit in most states.