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Many different criteria affect drug detection time. For example for fluid testing (urine, hair, blood) height, weight, physical activity, eating habits etc are important. For hair test depends on hair length and the amount of hair they take for testing. It's very expensive, but if the company pays, drug can be detected up to two-three years. That's why they say that hair is a road map of drug usage. I will give you a list with approximate time, drug can be detected.

Cannabis

· Single Use

Blood Test: 2-3 days

Saliva Test: 12-24 hours

Urine Test: 2-3 days

Hair Test: Up to 90 days

· Habitual

Blood Test: 2 weeks

Saliva Test: 12-24 hours

Urine Test: Up to 12 weeks

Hair Test: Up to 90 days

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13y ago
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14y ago

As long as they stay in urine using any other test system.

I never heard of anyone using high-performance liquid chromatography (HPLC) in a drug test, though; normally they run gas chromatography/mass spectrometry testing.

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Q: How long do drugs stay in your system for a lab test?
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