Drug Test Panels (Urine & Hair) — Complete Question Guide
Content last reviewed 2026-09-12 · Educational information — not medical advice
Quick answer
Drug panels screen 5–14 substance classes via urine (most common), hair (90-day lookback), blood (recent use), or oral fluid. Employer-mandated testing dominates demand; understanding cutoffs, windows, and prescription cross-reactivity prevents false-positive surprises.
What's on a standard drug panel?
5-panel (classic/SAMHSA): marijuana (THC), cocaine, amphetamines, PCP, opiates. Extended 9–12 panel: adds benzodiazepines, barbiturates, methadone, propoxyphene, MDMA, oxycodone. Hair versions capture the same classes across ~90-day windows.
How long do substances stay detectable?
| Substance | Urine window | Hair window |
|---|---|---|
| Marijuana (single use) | 3–7 days | ~90 days (all classes) |
| Marijuana (daily use) | 10–30+ days | |
| Cocaine | 2–4 days | |
| Amphetamines | 1–3 days | |
| Opiates | 2–4 days | |
| Benzodiazepines | 3–7 days (longer chronically) | |
| Alcohol (EtG) | up to 80 hrs |
Screening vs confirmation — why it matters
Immunoassay screens trade specificity for speed/cost — poppy seeds trip opiate screens, certain antidepressants trip PCP/amphetamine screens, CBD products occasionally wave at THC lines. Non-negative screens go to gas-chromatography mass-spectrometry (GC-MS) confirmation before anyone treats them as truth. Workplace MROs review prescriptions against positives.
How do I get tested?
Employers send authorization forms to national collection networks. Self-ordering exists for personal verification, court/documentation needs, and parental assurance — same collection centers, results in 1–3 days (urine) or 3–7 (hair, more processing).
Cost?
Urine 5-panel $30–60; extended panels $60–120; hair testing $80–150. Confirmation testing bills separately when triggered.
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Frequently asked questions
Do CBD products cause positive THC?
Pure CBD shouldn't; contaminated/mislabeled products with trace THC occasionally do, especially with heavy chronic use. Documentation of product certificates helps MRO reviews.
Secondhand marijuana smoke?
Extremes of unventilated exposure have produced positives historically — realistic settings don't. Non-negative results get confirmation anyway.