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SYNOPSIS The two types of drug screens are rapid tests and specific assays. Rapid tests are for a restricted range of substances (usually just drugs of abuse) and have limited sensitivity and specificity. When there are important medicolegal considerations, the results must be confirmed by more specific assays. Specific assays are labour-intensive tests that can detect most drugs but take much longer to perform. They are required where the concentration of the drug may lead to specificdoi:10.18773/austprescr.2001.098 fatcat:vqpt7v623bdxxjompu74gugv7e