Regulations Governing Drug Abuse Urine Testing Operations Article 29
Each batch of retest specimens shall include at least one specimen of quality control urines with a concentration of the drugs or their metabolites 40% below the cutoff value.
中文原文 濫用藥物尿液檢驗作業準則第29條
每一批複驗檢體中，至少應含一個在待測藥物或其代謝物閾值濃度百分之四十以下之品管尿液。