1.1 Halflife of TetraHydraCannabinol: The halflife of THC concentration ranges between 0.8 to 9.8 days. There is too much human variation to even approximate how long THC will be detected in the urine of an individual. Infrequent users with a fast metabolism will have the shortest detection time. Frequent users with a slow metabolism will have long detection times. The only way to estimate a detection time is to consider the lower and upper bounds (3-30 days), and decide based on the factors I've mentioned. if you smoke killer grade marijuana at a constant pace, it can stay in the body for 90 days, Marijuana is fat soluble. It stores in the fat cells of the body, the brain, the liver, the kidneys, in other words the major organs

1.2 Detection times of several drugs.

Approximate Detection Time in Urine using EMIT


Alcohol 24 hours N/A 12 hours
Amphetamines (except meth) 2 to 3 days up to 90 days 12 hours
Methamphetamine 2 to 5 days up to 90 days 24 hours
Barbiturates (except phenobarbital) 2 to 3 days up to 90 days 1 to 2 days
Phenobarbital 7 to 14 days up to 90 days 4 to 7 days
Benzodiazepines 1 to 5 days up to 90 days 6 to 48 hours
Cannabis (single use) 1 to 3 days up to 90 days 24 hours
Cannabis (habitual use) up to 3 years up to 90 days 2 days
Cocaine 1 to 3 days up to 90 days 24 hours
Codeine 2 to 3 days up to 90 days 12 hours
Cotinine (a break-down product of nicotine) 2 to 4 days up to 90 days 2 to 4 days
Morphine 2 to 3 days up to 90 days 6 hours
Heroin 2 to 3 days up to 90 days 6 hours
LSD 2 to 24 hours unknown 0 to 3 hours
PCP 5 to 7 days up to 90 days 24 hours

parenterally: 1 month [F3]
[PE] Performance Enhancers
[F1] 0.5 ng/mL by GC/MS
[F2] By RIA and GC/MS only. Not Detectable by EMIT.
[F3] By HPLC, RIA, and GC/MS. Not Detectable by EMIT.
[F4] 8-14 days as was reported in earlier versions and was incorrect.
[F5] No data available yet. I expect the detection time to be long because nicotine is fat soluble.
[F6] Detectable by EMIT and RIA, but rarely tested. A lab will only test for LSD when specifically requested

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