I am far from an expert on this subject, but if my reading on the subject is correct, there are many cannabinoids in pot, 2 of them are active: THC, and another whose moniker escapes me. Of the active cannabinoids, THC has a fairly predictable metabolism rate. It decays as your body metabolises it, and it is readily susceptible to quantitative analysis.
If a piss test looks for ANY cannabinoids, such as employment etc., then some of you are right, it can take a very long time for the body to rid itself of ALL cannabinoids, but as I understand it, THC and the other psychoactive constituent of cannabis do metabolize in a predictable fashion.
This is not wacky science either. Last summer when the legislature wrangled with this issue, they had two conflicting studies indicating at what point impairment occurs in the human being. They were unable to reach a conclusion last summer, and so tabled the issue until now. As I understand it, they now have a presumptive blood THC reading for impairment.
A presumption is rebuttable, and I am certain that as jurisprudence progresses, there will be attacks on the presumption on an ad hoc basis, as there are for DWAI and DUI cases even now. These attacks on alcohol impairment generally fail.
In the end, it is the obligation of the responsible user of intoxicants to conduct themselves in such a way that they do not harm others. Just as .08 is a presumption for DUI, I am glad that the legislature arrived at a presumption for DUID.





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