The good news is that the question around how far back does a mouth swab drug test go is not long at all. In fact, 48 hours or less unless you are incredibly unlucky through being a heavy smoker or user. There are some factors which will influence how far back a mouth swab drug test can go: The amount of a drug you take
What does it mean when a mouth swab drug test turns blue?
A. Once the Oral-Eze sample adequacy window turns blue indicating that a sufficient sample has been collected, instruct the donors to simply place their thumb on the ridges of the collector handle and slide forward (not push down) to detach the pad into the collection tube.
What color is a positive mouth swab test?
A pink colour in the test window indicates the presence of the analyte to which the test is specifically addressed and different devices are needed for the detection of each class of drugs of abuse.
What does it mean when your mouth swab turns red?
Negative Result: If there is a red or pink line in the test area under the drug name, the sample is considered negative for that drug. If a test line appears in the test area for all drugs, then the entire sample is considered negative.