In recent years, the interest in the use of oral fluid as biological matrix has increased significantly, particularly for detecting driving under the influence of drugs (DUID). In this study, the relationship between the oral fluid and blood concentrations of drugs of abuse in drivers suspected of DUID is Nevertheless the data reflect the variability of the OF/B ratios in drivers under the influence of drugs.The wide range of the ratios, however, does not allow reliable calculation of the blood concentrations from oral fluid concentrations.

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The proportion of oral fluid samples containing psychoactive substances was lower for truck drivers than for car or van drivers.

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