Actually there are two kinds of drug urinalysis – quick EMIT test and exacted drug-urinalysis test.
EMIT test can in short time detect the usage of such drugs as cocaine, crack, methamphetamines, amphetamines, ecstasy, PCP, heroin and morphine.
Drug-urinalysis test makes possible to detect harder drugs. The samples are sent to laboratory for the gas chromatography and spectrometry. Usually the results are ready in about 3 days.
Generally, time needed for detecting drugs in organism depends on kind of drugs. For example, some hard drugs, which harm the body and brain most of all, can be detected only in few hours after the intake. Moreover such drugs as marijuana (as well as hashish) can be detected even up to 6 weeks before use. But eventually you can still test positive for drugs even if you are totally clean.
Related Post: Types of Drug Testing

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