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How long do drugs stay in your system?

Drug test

Drug detection factors

The length of time that a drug is detectable in the system depends on a variety of factors, including:

Drug detection times

Please use these figures as a guide only:

Drug detection in hair

Drugs or their metabolites may be detectable in hair. Hair grows at a rate of approximately 1cm per month so depending on the length of hair it may be possible to determine drug use over recent months.

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