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Lot series of extremely homogeneous hair reference materials in 7 relevant concentration levels, prepared from one single, meticulously homogenized drug-free hair pool of cut European human hair. These divided lots have been spiked gravimetrically with 47 drugs of abuse and their metabolites and MPPH as additive:
L0 Negative Control
L1 Close to the limits of quantification or detection (method-dependent)
L2-4 In the cut-off ranges of various international professional societies u