It actually sounds as if it might have been a bad test! My understanding ( and I may be wrong here) is that, regardless of the type of test-urine, saliva, blood, etc.-it is supposed to measure the concentration of the substance in question in your system. The route of administration does not matter! Whether you snort, swallow, plug, or inject, the drug
is in your system. The only difference between different routes is the speed of onset. That being said, I understand there are other factors, such as first-pass metabolism, which may come into play, but I am trying to keep it simple here.
I would ask for a re-test.