Abstract
The number of traffic accidents, caused by driving when intoxicated by alcohol (DWI), is increasing with the arrival of the Chinese automobile society, and affect the society seriously. DWI has become brutal killers increasingly. The DWI has caused much economic losses and casualties in the world. In order to eliminate the DWI, many countries have made lots of ways to prevent drunk driving. A hand-held breath alcohol tester and headspace gas chromatograph blood alcohol tester are always used by the police. A handheld alcohol tester has many disadvantages, such as wasting police power, heavy workload, low efficiency, narrow coverage and affecting the normal traffic. Therefore, the study of the system to prevent drunken driving has a very important practical significance.
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