I had to do a mouth swab test and it tested positive greater than 0.8 the legal limit and I have not drank in over 5 years. someone please tell me how that happens ? I listed all my medicines I am on ad I am A diabetic I have out of control blood sugars for a long time and I eat foods wit artificial sweetners in them. I take many medications but they said none of my meds could have caused this positive test. But yet I go to my family doctor and have a blood test done and it came back at 0.3.. how does tihs happen when I do not drink.?