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The most common tests are immunoassays that test for either alcohol or its metabolites. Blood tests are another, ordinarily used after traumatic events such as traffic crashes. Other tests, normally used for confirmation, involve photometric analysis of either urine or blood.

The over-the-counter tests, and those used by most screening agencies, are immunoassays, where antibodies sensitive to the chemical being tested for are embedded in the test strip. Their reaction causes the color change.

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15y ago

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