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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes The Drug Test Be Positive For The Cocaine With Was Not Use Since 2 Years?

My best friend is a recovering heroin addict; she has been clean for nearly 2 years. She is in outpatient rehab, is urine tested monthly for a prescription for suboxone. She just tested positive (both urine test and mouth swab) for cocaine use but has never used it; the results also claimed she wasn t taking her meds. How is this possible?
Wed, 10 Sep 2014
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Addiction Medicine Specialist 's  Response
Topical anesthetics containing cocaine or perhaps anything with anaesthetics like dental procedures, lidocaine patches, novacaine, etc. Furthermore the usual urine dipstick can just have false positives from unknown reasons
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What Causes The Drug Test Be Positive For The Cocaine With Was Not Use Since 2 Years?

Topical anesthetics containing cocaine or perhaps anything with anaesthetics like dental procedures, lidocaine patches, novacaine, etc. Furthermore the usual urine dipstick can just have false positives from unknown reasons