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Causes of false negative drug test

There are many causes of a false negative drug test and these are usually the result of taking medicines or certain food products that result in a wrong result. However, a false negative in its true sense is successful cheating. This means you have taken drugs but are showing a false result of negative. This can be done by masking the sample by using medicines, by using synthetic urine, or by substituting the sample itself. Some safety-sensitive establishments such as the military make it a point to see to it that the sample is not substituted.

A false positive on the other hand is one in which you test positive for drugs and have not in fact taken any drugs sold illegally. There are many drinks and medicines that can cause a screening to come out positive for some drug. These include cough syrups that contain codeine which is an opium derivative and other medicines such as morphine. Usually a person is asked to declare if he has taken any prescription drugs so that false positives can be avoided. Such wrong results can also be seen where people consume foodstuff that is derived from drugs but is not harmful or intoxicating. The epitome of such food products are poppy seeds which are in fact derived from opium but are not illegal.

A false negative drug test is one in which you test negative for drugs even when you have taken these recently. However false results are seldom seen if hair samples are used since it is not possible to makes the toxins present in hair follicles. However, since these tests are expensive they cannot be conducted on a large scale and urine tests are the most common form of drug screening. However it cannot be denied that some of the drugs or chemicals are naturally present in our body and there are cutoff levels for all the drugs. For instance, cocaine drug test cut off level may be different from dopamine levels which are found in more quantities, naturally, in the human body compared to cocaine.