How Long Does Cannabis Stay In Your System?

How Long Does Cannabis Stay in Your System?

Tennessee Employer Testing Employee For Marijuana

If you're vaping, eating edibles or just curious, understanding detection times matters—especially in Tennessee, where random testing can make or break opportunities.

Detection Windows: THC & Its Metabolites

• Urine:
  • One-time use: ~3 days.
  • Moderate (several times/week): 5–7 days.
  • Daily users: 10–15 days.
  • Heavy/chronic users: 30 days or more—some rare cases report up to 102 days.
• Blood:
  • Typically detects THC for only up to ~12 hours, but heavy users may test positive for up to 30 days. 
• Saliva:
  • Occasional users: up to ~24 hours.
  • Frequent users: up to ~72 hours. 
• Hair:
  • Up to 90 days detection window. 

Why It Lingers

THC is fat-soluble—it gets stored in your fatty tissues and released slowly over time. Factors like metabolism speed, body fat, frequency of use, and hydration all play a critical role in detection timeframes.

CBD Doesn’t Show—but It Can Backfire

Drug tests typically don't detect CBD—but here’s the pitfall: full-spectrum CBD products can contain up to 0.3% THC (even if mislabeled). With repeated use, that trace THC can build up and trigger a positive test.

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Tennessee-Specific Angle: Testing, Politics & Power

In Tennessee, employment drug testing is widespread in some industries. While cannabis remains illegal for recreational use, Tennessee lawmakers have historically supported broad drug testing policies.

• Julia Hurley co-sponsored Tennessee legislation requiring drug testing for welfare (TANF recipients)—later she even opposed applying such testing to state legislators themselves.
• Governor Bill Lee has opposed marijuana decriminalization and medical legalization, maintaining resistance against reforms that could reduce positive drug tests in workplaces.

In practice, these policies reinforce a system where even low THC detection or accidental exposure can mean job loss or denied benefits—especially for people in safety-sensitive jobs like healthcare, education, or public service.

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TL;DR – What to Know

• Urine testing is the standard—expect 3 (occasional) to 30+ days (heavy use).
• Blood/saliva capture recent use; hair looks back months.
• CBD may be legal, but could **still trigger** a THC-positive result.
• In TN, politics shape drug testing norms—welfare & public safety remain tightly enforced.

Pro tip: If you're facing testing at work—or even just want to stay ahead of the system—know your usage patterns and test type. And in Tennessee, keep an eye on how lawmakers’ policies affect the consequences if you test positive.