Is a faint line on a drug test a negative result?

Yes. It is very important that a line in the test region (no matter how faint) must be considered a line, and must be considered negative. This is how drug testers in Australia are trained.

This is the most common question we receive. The colour, or density of the line have no meaning on the drug test. This answer was backed up by our manufacturing engineers.

As you can see by the picture A below, there are variations in line densities. This does NOT mean that there could be traces of the drug in lighter lines.

Picture B has a non-negative result for AMP Amphetamines as there is no line at all, and must be confirmed either positive, or negative by pathology.



Urine drug tests will not tell you how much drugs are within a sample (like a breathalyser), rather if above, or below a cut off point. eg marijuana has a cut off point of 50ng/ml. The test will only show negative, or non-negative either side of this point.

Drug tests cannot measure in a quantitative measurement. They really just give you a yes, or no answer.

If you have a non-negative result on a drug test, it will need to be confirmed positive in an accredited lab. We can help you with this. Please ask us how by contacting us here