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Read about interfering substances in drug testing marijuana.

There are two types of assays that are generally utilized for the screening of drugs in biological specimens like urine, hair, blood and saliva. The immunoassay is less expensive, quick and sensitivity but it lacks testing sensitivity. It is generally utilized to test the drug test classes. It fails to distinguish between the drugs within a class. The other technique is the combination of gas chromatography along with mass spectrometry. This is an expensive technique and it consumes a lot of time. GC-MS is considered to be the gold standards for confirming a positive for drugs that has been given by an immunoassay. Thus GC-MS technique can be used to avoid all the interfering substances in drug testing marijuana.

A false positive is just a case of mistaken identity when a test detects a substance having similar chemical structure to any drugs and tests positive for that drug when it was never used. False positive may occur in urine specimens obtained from patients who unknowing ingest the products that might have the drugs of abuse for one hit weed drug test. Many products that are available in the market can contain drugs like opiates and marijuana. Several reports suggest that very little amount of poppy seeds can give a false positive for morphine and codeine. Government took some efforts to reduce the chances of false positive due to consumption of poppy seeds by increasing the threshold level of certain drugs.

Second hand smoke is a major reason that can cause a false positive for marijuana. Many prescription drugs, over-the-counter medications and food stuffs can prove to be interfering substances for marijuana. There are many controversies on whether the cutoff for detection of cannabis is very low in blood and urine drug tests that are leading to a high degree of false positives for marijuana. If you feel that the drug test result is false positive then demand the authorities to perform a GC/MS for confirmation. You can always carry the prescriptions and inform the labs about the medications that you have been taking. This will surely reduce the chances of false positives!s