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A mouth swab test or a saliva drug test is mainly used because it is cheaper than urine or blood tests. It can show if an individual has recently taken any type of drug, but they're not as complex as urine or blood tests. For example, if you have smoked marijuana recently - the mouth swab test can usually detect it for up to 4 or 5 days. If you smoke marijuana and have a urine test done, it can be detectable for up to 30 days if you are a frequent smoker.

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16y ago

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