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most drug testing methods do not actually test for the presence of drugs. This is because most drugs break down very quickly in the body. Therefore, the test looks for the chemicals that remain after the drug breaks down. These are called the metabolites.
The metabolites of drugs can be detected in blood, urine, hair, sweat or saliva. The most common type of testing is urine.
The presence of drugs can be detected in urine, for most drugs, for up to three or four days after use, although in the case of some drugs such as cannabis and benzodiazepine they can be detected for several weeks, especially after heavy use. Drug use can be detected in blood for roughly the same period or slightly less, and for an even shorter period in saliva. Most drugs can however be detected in hair for up to 90 days.
Different companies will test for different drugs but the most common package is a urine test for cannabis, cocaine, amphetamine, methamphetamine, benzodiazepine and opiates.
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