i was supspended from my old school for weed, and before i got swabbed i rinsed my mouth out with hot soapy water like 3 times before i got tested and i still failed, luckily i didnt get a DUI though
there was a High Times that had an article about all the different types of drug tests I already threw it away but it said mouth swabs can't detect THC...
You should be ok...rinse with mouthwash, vigorously brush the inside of ur cheeks/gums, and when they test u fuck with the test, take it outta the spot between ur gums n cheek early or don't leave it in there, that's what I did and I smoked the night before and still got the job (whether I passed is another question but I assume I did), and mouth swabs will detect thc, but it's shorter duration than harder stuff.
Brush the inside of your mouth vigorously with your toothbrush. It's gonna hurt a little bit so use a high alcohol content liquor afterwards - I recommend whiskey. Yes, it hurts like a bitch right afterwards (especially if you draw blood while brushing) but the alcohol will stimulate the removal of old cells and the production of new ones. Keep your mouth as wet as possible after that.
Then, before the test wash your mouth out with a mixture of olive oil and water, rinse with plain water and bring a bottle of water with you. Before they test you, wet up with some water.
Well guys thanks for all the advice but luckily they were to busy today so i just got interviewed and didnt have to do the drug test. They said they would call me back to do it in a day or two so i think im good.