norml seems to be down.

here's the cached version:
Drug Testing Tips - NORML

learn something new every day.

BLOOD TESTS: In some situations, including accidents and roadside sobriety checks, blood tests may be used. Blood tests are a much better gauge of current impairment than urine tests because they detect the actual presence of THC in the system; however, they can be sensitive to other metabolites as well. Blood tests generally register positive for just a few hours after smoking, though heavy chronic smokers may be positive for a couple of days. Less sensitive are saliva tests, which register positive for about 2-4 hours after smoking. If you have used marijuana in the last few days but are not currently under the influence, you should insist on a blood (or saliva) test instead of a urine test if at all possible, since you are more likely to turn up clean. On the other hand, if you have smoked recently, you may do better to take a urine test, since this will at least leave open the question as to whether you were under the influence. Also, urine doesn't turn positive until several minutes after smoking.
copobo Reviewed by copobo on . semi driver in fatal, 'on' marijuana so does this mean his piss test was positive, or that he was ripped at the time of the accident? 'had been smoking marijuana' - when? while he was driving? a half hour ago? yesterday? 2 weeks ago?? -- Semi driver smoking pot during Commerce City double fatal - The Denver Post A semi-tractor trailer driver had been smoking marijuana when he crossed into oncoming lanes and caused a fiery crash with a dump truck that killed himself and the other driver earlier this year. Daniel Rating: 5