![]() False positives are not common in drug screenings, but they are possible.ĭrug tests may screen for marijuana (THC), opiates, cocaine, amphetamines, methadone, steroids, barbiturates, benzodiazepines, phencyclidine (PCP), ecstasy, or more. Certain foods, medications, or other substance can cause a false positive reading. The phrase “false positive” refers to results on a drug screening that say the test detected the presence of a substance when a person has not actually taken the substance. Knowing what a false positive is and how to avoid this problem can be important for anyone expecting to take a drug screening. However, it is possible for a test to have a false positive result. Drug screens check a person’s system for the presence of drugs or illegal substances. One of the most common reasons is for employment. ![]() People may be asked to take a drug test for a few different reasons.
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