Drug Testing Methods
Learn about the different ways drug testing is performed and which method is right for your situation.
Urine Drug Test
The most common drug testing method. Detects recent drug use and is affordable and widely available.
- Detection Window: 1-30 days (varies by substance)
- Accuracy: High when properly administered
- Common Uses: Employment, random testing, medical
- Pros: Affordable, widely available, established protocols
- Cons: Easier to adulterate, privacy concerns
Hair Follicle Test
Tests hair samples for drug use over a 90-day period. Harder to cheat but more expensive.
- Detection Window: 90 days
- Accuracy: Very high
- Common Uses: Pre-employment, safety-sensitive positions
- Pros: Long detection window, hard to cheat
- Cons: Expensive, doesn't detect very recent use
Saliva (Mouth Swab) Test
Non-invasive testing that detects very recent drug use. Quick results and hard to adulterate.
- Detection Window: Hours to 2-3 days
- Accuracy: Good for recent use
- Common Uses: Roadside, workplace, post-accident
- Pros: Non-invasive, quick, supervised collection
- Cons: Short detection window
Blood Drug Test
The most accurate method for detecting current impairment. Short detection window.
- Detection Window: Hours to 1-2 days
- Accuracy: Highest accuracy
- Common Uses: Medical, legal, accident investigation
- Pros: Most accurate, measures current impairment
- Cons: Invasive, expensive, short window
Comparison by Detection Window
| Substance | Urine | Hair | Saliva | Blood |
|---|---|---|---|---|
| Marijuana (THC) | 3-30 days | 90 days | 24-72 hours | 1-7 days |
| Cocaine | 2-4 days | 90 days | 1-2 days | 1-2 days |
| Opiates | 2-4 days | 90 days | 1-4 days | 1-2 days |
| Amphetamines | 1-4 days | 90 days | 1-3 days | 1-2 days |
| Benzodiazepines | 3-7 days | 90 days | 1-10 days | 1-3 days |