what does a negative drug screen mean
Negative means that the concentrations in the urine sample are below the designated cut-off levels for a particular drug tested. A negative drug test result does not always mean there are no drugs present in the person being tested, it means there are not drugs present above the cut off limit.f you are using a home drug test, you will want to make sure the cut off level of the test you are using is the same as the one you will be taking elsewhere. Please check your instructions for more information on the cut-off levels being used in your test.