 [ Symptoms ] smoked a blunt about 5 weeks ago have not smoked for 6 months before that how did i fail urine test  i am on probation for manufacturing and distributing marijuana even though i had less than 3 grams on me i failed a urine test last month after i smoked a joint at a party i failed that month i have not smoked since then but i still failed my urine test this month  [ Disease ] i would suggest you tell them to check your levels often times they will record the thc levels on a failed test they should be able to determine by your levels that you have not smoked again