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Alcohol tests currently used by the police are basically using the same principle, that is, the alcohol concentration and Alcohol breathalyzer concentration will be showing a relationship between a certain percentage. When people drink, the alcohol is absorbed, but will not be digested, part of the alcohol evaporates out through the alveoli, in vitro re being exhaled. It was determined that the alcohol concentration in exhaled breath and blood alcohol concentration ratio is 2100:1, that is, each 2100ml contains alcohol breath, and 1ml blood contains alcohol, the amount is equal . With this ratio, measured by traffic police to the driver's breath, and soon were calculated by measuring blood alcohol content. If there is no alcohol test of the "help", the police only through blood tests or urine tests to determine the way the driver has not had a drink, but this inspection will outlay of 1-2 days.

The current internationally accepted limit of drunk driving, there are two, one is "drunk driving", one is "drunk driving." According to the provisions of the amendment in 2003, when the driver per milliliter of blood alcohol content greater than or equal to 0.2mg, the traffic police will be identified as "drunk driving"; greater than or equal to 0.8mg when it will be found as "drunk driving." Both of which are considered illegal to drive, this does not mean we must wait until the driver has been drunk to the extent of confusion, be considered violated the traffic laws.

Three Kinds of Alcohol Breath Testers

While testing the same principle, but how to quantify breath alcohol content, or different types of test instrument has a completely different approach. At present, there commonly used alcohol test, according to different testing methods can be divided into three categories. Breathalyzer is a chemical reagent used to determine the alcohol concentration in exhaled breath tester. In 1954, Indiana Birkenhead Robert Stein, a police invented the Breathalyzer, which sets the test instrument alcohol became the world's first test tool. Even today, it is still the world's most frequently used alcohol test.

In addition to the components generally are outside the test, breathalyzer comes with two glass bottles filled with chemical mixtures. When the subjects were breath through the glass, if the gas contains ethanol, a mixture of the bottle from orange to green, while the chemical reaction so that the resistance will move the pointer, accurate marking out of breath alcohol concentration, and converted by the microcomputer to blood alcohol concentration.

The other two are the Intoxilyzer test instrument and Alcosensor III or IV, the former by the degree of alcohol molecules absorb infrared rays to determine the alcohol content; the latter with the positive and negative electrodes through the fuel cell to complete the testing. The electrode was made of platinum metals, when the alcohol into the fuel cell when the gas, and platinum will react to generate electricity generated readings.

Alcohol Breath Analyzer is very sensitive. Typically, they are used as law enforcement tool, but now, it is also common among drivers hot. Pre buy alcohol tester, after all, a way of self-warning; However, this instrument will not change either the blood alcohol concentration readings, and will not reduce the risk of drink driving, the "you can use this instrument to check by traffic police, "the rumors are groundless.