JKD, if you stopped a month ago you will pass an oral fluids test. Urine has a much longer detection window than oral fluids so even though you failed a urine test you should pass the oral fluid. I saw you ask this in another post and what I meant by brands. Well there different companies that make oral fluid tests and most of them have a detection window of 24-36 hours after last use but some I have seen as high as 48-96 hours.

If it makes you feel better do the trick Giggy suggested. I'm not so sure all of them actually swab as much as they just make you hold it in your mouth for a certain period of time but like Giggy is saying the key is to keep it off your cheeks and almost in the space with your teeth and tongue. Kind of keeping it suspended in your teeth not touching much of anything.