I was driving to pick up my daughter from school and had to complete a rolling test, while providing this test it had said failed. Prior to providing the test I had put a pinch of Cope in and it had failed. I do believe that this had something to do with the fail. I redid the test with/out the after three minutes and passed the test. Either the product is faulty or the tabacco has something to do with the failure. read full review »