Well if it was 9 weeks since you smoked when you had that faint line and failed the test, it probably has been longer then that if you havent smoked yet, so a good 12 weeks probably and if your drinking a good amount of water for your weight * i think its like 8-10* you shouldnt test positive at all for the test. Wow on the failing the bus driver part though.. Usually they make you go to rehab...