●
Analysis of the final wash: An analysis of the last of the six wash solutions to ensure that all contamination has been removed or accounted for.
●
Wash criterion: Te amounts of drug in the last wash relative to that in the washed hair—an indicator of whether the sample has been sufficiently decontami- nated and the result accurately reflects the ingested dose. Tat is, the amount of drug in the last wash is multiplied by 5 to represent 5 more hours of washing, and that number is then subtracted from the amount of drug in the hair. Te final outcome of the calculation must be at or above the cutoff to be called “positive,” demonstrating ingestion of drug.
●
Metabolite identification: If the wash criterion fails, the metabolites in the hair sample and the last wash are examined (the metabolite ratio in the last wash is oſten similar to that in the digested hair).
●
Cutoff levels: Te minimum measure- ment applied to drug testing so that only amounts of a drug or its metabolite above a specified level is reported as positive. Tere has been further validation of
this effective extended wash procedure and wash criterion in numerous other studies including:
●
A 2011 Department of Justice (DOJ) study demonstrated that this published wash procedure was the only method
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