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It depends on the drug in question, the particular metabolism of the user, and whether they're an occasional or chronic user. Some drugs clear below the detection threshold in a few hours, others can be detected for weeks.

There can be other factors as well; for example, some (legal) over-the-counter medications can affect drug retention times (usually making them longer, so don't go getting ideas).

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13y ago
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8y ago

First of all, blood tests don't go back. Every drug will stay in your system for a certain amount of time. If that there is a drug in your system it will show up in the blood.

In order to get an answer, you need to be specific about which drug is being tested for.

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11y ago

90 days in a blood test 30-60 days in a urine test

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9y ago

The mouth swab test for alcohol can only test for alcohol from 12 hours back. There is not yet a mouth swab to detect long term alcohol abuse.

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12y ago

Normally no more than two or three days.

in urine, 72 hrs tops.

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14y ago

usually about 8 to 12 hours for full metabolization of the alcohol with a normal BMI and liver function.

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13y ago

30 days.

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Q: How far back can a urine or blood test Test for alcohol?
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