Here's some info I found that might help ya out.
Amount and Frequency of Use: Single, isolated, small doses are generally detectable at a lower boundary. Chronic and long-term use typically result in detection periods near or at the upper boundary.
Metabolic Rate: Individuals with slower body metabolism are prone to longer drug detection periods.
Body Mass: In general, human metabolism slows with increased body mass, resulting in longer drug detection periods. In addition, THC (marijuana's active ingredient) and PCP are known to accumulate in fatty lipid tissue. Chronic users, physically inactive users, and individuals with a high percentage of body fat in relation to total body mass are prone to longer drug detection periods for THC and PCP.
Age: In general, human metabolism slows with age, resulting in longer drug detection periods.
Overall Health: In general, human metabolism slows during periods of deteriorating health, resulting in longer drug detection periods.
Drug Tolerance: Users typically metabolize a drug faster once a tolerance to the drug is established.
Urine pH: Urine pH can impact drug detection periods. Typically, highly acidic urine results in shorter drug detection periods.
Note: In a small percentage of cases, users may test positive longer than times shown - most notably in cases of long-term chronic abuse, in individuals with significant body mass and/or body fat, and in individuals with health related issues resulting in abnormally slow body metabolism.
These Drug Detection Times for a urine drug test, a blood drug test, a saliva drug test or a hair drug test are expressed below in terms worse case scenario, the number you should bet on to be safe and pass your drug test.
Marijuana
aka: Blunt, Grass, Herb, Pot, Reefer, Sinsemilla, Smoke, Weed
Medical use:
None
Method of use:
Oral
Period of detection:
Casual-Up to 3 days
Habitual-Up to 12 weeks
Tetrahydrocannabinol
aka: Marinol, THC
Medical use:
Antiemetic
Method of use:
Oral, smoked
Period of detection:
Up to 5 weeks
I have the info on most types of drugs if anybody needs em.
Good luck with the test.