When one enters a drug program they do not start testing for marijuana for 3-4 weeks because that is how long one can still test positive for it. So if I take a couple hits and three weeks later some drunk crashes into my car I will test positive for marijuana.<quoted text>
The study you cited it worded... strangely. 27% of all seriously injured drivers tested positive for weed... this does not take into account whether or not the "stoned" driver was actually responsible for the crash. It also does not take into account whether or not weed was the *only* drug present in their system. All of the available evidence shows that driving drunk is far, far more dangerous than driving while high, but either way, the relative danger of driving while impaired on certain drugs is completely irrelevant. No one should ever drive while intoxicated by a substance which impairs their driving. Which drug is more dangerous than which with regards to driving is a pointless question - driving while impaired is a crime, and that is the point where drug use crosses over from vice into criminal act, and it should be punished as such.
LSD can not be tested for. You can be in a drug program and use it every weekend and they would never know.