Justice committee  I think that the oral fluid screening devices are probably an aid to law enforcement because they give an almost immediate indication, usually within three minutes to five minutes. When pulling a blood sample or taking an oral fluid sample to send to a lab, you can wait weeks, if not months, to get a test result back.

Justice committee  I would answer that with a no. I think the fact that someone's a cannabis user is not a bar to driving, but when someone smokes cannabis, you usually will see impairment for two to three hours, sometimes stretching out to four or five. I think people who want to use marijuana, whether it's for therapeutic purposes or recreational, should understand they should not get behind the wheel for probably six to eight hours after use.

Justice committee  I would agree with Dr. Kelsall. Again, six months is a very short time for a public health campaign to change attitudes and behaviours. Most previous ones on smoking, exercise, and other things, have taken a number of years to penetrate to thinking and behaviour. I don't think you'll get all that far in six months.

Justice committee  Thank you. We have in the United States, as I'm sure you're aware, for many years now been altering, on a state level, our legal prohibitions about marijuana. We have quite a few states that have passed measures authorizing what's called medical marijuana use. Some of them contain very few restrictions.