There are just a couple of possibilities. Either you might have taken the drug within the past few days or it might be a false positive. False positive results come up due to the intake of prescription drugs or over the counter medicines. Ibrufen is likely to cause a false positive in a marijuana test. Lotions and shampoos that contain hemp can also result in a false positive in marijuana test. When you consume poppy seeds based products, you are likely to test positive for opiates. Drugs that are rich in phenypropanolamine/ephedrine when consumed can cause a false positive for amphetamines. Failure in Drug Test: Points to Contemplate
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