No, there isn't the literature there is for alcohol. We do have to remember that there are two sections in the Criminal Code about impaired driving: one of them is the over 80 charge; the other is impaired from drugs or alcohol, which means that it doesn't matter what the alcohol level is, you could be charged if your blood alcohol concentration is 30 or 40 if you are showing outward signs and your ability to operate a motor vehicle is impaired. So it doesn't matter what the blood alcohol concentration is. Therefore, it also doesn't matter what the drug concentration is. You have to have the evidence of impaired driving and you have to see the outward signs in the individual in order for you to proceed with an impaired driving charge.
On June 12th, 2007. See this statement in context.