Justice committee  There's a very simple way to know. None. That's the only way to know. The question that I've received from the general public and other people over the years that I've been doing this kind of work has been, “How much can I drink and still drive?” We can do calculations and we can

Justice committee  There are many parts to that question. Way back when the 80 limit was introduced, there was very clear evidence that was very consistent across studies that when you looked at experimental studies that looked at impairment, there was very little doubt that people who were over

Justice committee  There are indeed some differences you can identify in terms of the level of impairment you see in habitual and novice users. It really depends on the individual. The one thing we've learned in doing studies is that it is very difficult to set a threshold at which impairment occur

Justice committee  You can detect presence through sweat, yes. A system is being pilot tested now whereby essentially they use a person's sweat from their fingerprint to detect certain substances.

Justice committee  Yes. The level of cannabis decreases very quickly. I didn't say it got completely eliminated. In some cases, it can be shown to stay within the body for a substantial period of time.

Justice committee  It would be nice if it was, but I'm not sure that everybody will be ready. I'm sure it will be a learning process.

Justice committee  Mr. Chairman and committee members, thank you for the opportunity to address you today. My name is Doug Beirness. I am a senior research associate and subject matter expert on impaired driving with the Canadian Centre on Substance Use and Addiction, known as CCSA. CCSA was crea

Justice committee  Thank you.