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Toxicology includes both Presumptive (Qualitative immunoassay screening) and Definitive (Quantitative or Confirmatory) analyses. Drug testing involves one or more techniques used to identify specific drugs or their metabolites.
Presumptive screens attempt to identify a wide range of illicit and therapeutic substances. There is no simple presumptive process that can identify all drugs.
A definitive analysis both identifies particular substances and establishes how much is present. Definitive analyses are more complicated than presumptive analyses because they must be calibrated and controlled for each particular substance.