Drugs of abuse can be detected in

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The main idea is that there isn’t just one way to detect drugs of abuse; different specimen types serve different purposes and timeframes. Urine testing is the most common method because it can reveal recent drug use over a window of typically days and is well established with standard cutoff levels. Saliva testing is useful when you need a quick or noninvasive sample that reflects recent blood concentrations, making it practical for roadside or rapid screening, though its detection window is shorter. Hair testing provides a long-term record, showing drug exposure over weeks to months as substances are incorporated into growing hair, giving a historical view of use rather than a snapshot of recent intake. Because each type of specimen has its own strengths and limitations, multiple matrices can be used to detect drugs of abuse. That’s why “All of the above” is the best answer.