Which is why they need to find and only test for a chemical (?) only found in MJ that can only be detected for a reasonable amount of time, like 2 hours or something. Or based on whatever your drug testing policy is. So I think we are looking at a real issue. How motivated is the govt to find and isolate the one chemical compound only located in THC. It could take them quite awhile to find that test.
Now while we are on the subject, are we being led to believe that when alcohol consumption and automobiles became an issue, all sames of both were halted until a reliable breath test was standardized? I think not. So the courts will have to rely on the testimony given to determine if the individual was under the influence of drugs or cannabis. My guess that is exactly what they are already doing?