Understanding Secondhand Marijuana Smoke Drug Test Cut Off Levels

Secondhand Marijuana Smoke Drug Test Cut Off Levels: What You Need to Know

What Are Cut Off Levels?

Cut off levels in drug tests indicate the minimum concentration of a substance that will produce a positive result. For secondhand marijuana smoke, these levels vary depending on the testing method and the specific drug test.

Can You Fail a Drug Test from Secondhand Smoke?

Common Cut Off Levels

• urine tests often have a cut off level of 50 ng/mL for THC-COOH, which is the primary metabolite of THC.
• saliva tests typically have a cut off of 25 ng/mL for THC, reflecting the shorter detection window.
• hair tests may have a cut off of 1 ng/mL, as THC can be detected in hair over a long period.

Factors Influencing Levels

The cut off levels can be influenced by the type of drug test, the sensitivity of the test, and the concentration of THC in the marijuana smoke.

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