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Can mouthwash interfere with the results of a breath alcohol test?

April 26, 2017alcohol breath interfere mouthwash results Test

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Can mouthwash interfere with the results of a breath alcohol test?

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Yes. Proper test procedure requires that the subject have nothing in their mouth for 10 to 15 minutes prior to testing. If the subject has anything with alcohol in their mouth just prior to testing, the alcohol in their mouth will contaminate the test, giving an artificially high reading. However, 15 minutes is sufficient time for all mouthwash to be dissipated.