drug testing
It is possible to detect the presence of alcohol,
other drugs
affecting the central nervous system, and drugs used to enhance athletic
ability by a variety of tests. Body material such as urine, blood, exhaled air and hair
can be analyzed by instruments capable of detecting minute concentrations of drugs or
their breakdown products. Another commonly used type of test measures the physiologic
effect of the drug, as for example when a law enforcement officer requires a suspect to
walk on a straight line to detect alcohol intoxication.
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