How long will concerta show up on a mouth swab drug test?

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Answered: What causes librium to show up in drug test if librium has never been

The most likely cause would be the ingestion of another benzodiazepine.

Answered: How many years can an employer go back on a drug test

It depends on the test. It's up to 3 months for a hair and urine test, up to two weeks for blood test, and up to a few days for saliva test
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