Justice committee  That is not completely accurate. The chart that I showed where we overlaid the times to collect blood versus the decline in THC levels in blood is for cases of crashes where the mean time between the incident and collecting the blood was about two hours. However, for proactive ca

Justice committee  Yes.

Justice committee  That is correct.

Justice committee  The problem is that whatever you find in the forensic test tells you absolutely nothing about the level of THC at the time of the incident because of that decline in the blood.

Justice committee  That is a dilemma with legalizing marijuana.

Justice committee  All I can rely upon, sir, are the experiences we've seen in places where we've had zero tolerance laws. It is very similar to the tandem per se. Tandem per se is a little more specific, and it is directed at impairment rather than simply presence and usage of drugs. That's all I

Justice committee  I have no such evidence in Canada. Does anyone?

Justice committee  [Inaudible—Editor]

Justice committee  In Colorado, it is very, very rare, and what is rare is the conviction. There are prosecutors who have attempted to prosecute people, but none of them have succeeded, that I have found. I have no data on Canada.

Justice committee  Don't adopt the per se limits of Bill C-46. Instead, put in the tandem per se. I think that would fix it.

Justice committee  If they cannot drive safely, they should be banned from driving, yes.

Justice committee  I'll talk first of all about this issue of tolerance between the heavy users and the occasional users, which is the fundamental part of your first question. We know that some studies show that people do develop tolerance to all drugs: alcohol, opioids, THC, and so forth. The le

Justice committee  Let me recall a point, one that was raised, if I may respond to the member. It is possible to prosecute someone for impairment even if you have no laboratory test, but it turns out as a practical matter that if there is a laboratory test and that individual tests below the per se

Justice committee  In concept I agree. I have gone to prosecutors in the state of Colorado and asked them with respect to alcohol alone to give me examples of cases in which they have had a defendant who tested below .08 yet was convicted of driving under the influence of alcohol. I have not been a

Justice committee  Thank you very much. Ladies and gentlemen, marijuana's THC does not impair a driver's blood; neither does alcohol, for that matter. Both of these substances impair a driver's brain, making the person unsafe to drive. We only test blood as a surrogate to try to learn what's in th