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Cannabis DUI in Canada – What are they, and how do they work?


DUI checkpointWith Cannabis becoming common place in many areas around the world, it is becoming ever more important to ensure the safety of not only those who use it, but those around them as well. An area where this is especially important, is road safety. As we all know, operating a machine or vehicle while under the influence of any type of mind alerting substance is not only extremely dangerous, and may not only cost you your life, and of anyone around you; it is also highly illegal in most places around the world. As it should be. Typically, such crimes are committed under the influence of alcohol, or narcotics but not all; and as Cannabis becomes more common, law enforcement agencies are finding that there may be more stoned drivers on the road than ever before. This has become a major concern in places where Cannabis is either legal, or soon becoming legal such as in Canada. Many organizations, individuals, and law makers are very concerned when it comes to the safety of the roads when Marijuana begins to become recreationally legal in Canada, but the Federal Government has taken steps to prepare, looking at what has happened with their neighbors south of the border for inspiration. But as many people know, Cannabis and alcohol, as well as other drugs, all effect the body extremely differently, and ways to determine the intoxication level of an individual may not be as accurate as some would like. So what exactly is changing when it comes to DUI in Canada, and how does Cannabis fit into the mix?

What is a Cannabis DUI?

Cannabis DUIAs of April 2017, there has been legislation put forth that would overhaul the entire Transportation Penalty system in Canada, in preparation for the legalization of recreational Cannabis. To prepare, we will be discussing just what these changes are when it comes to Cannabis, and stoned driving in Canada. Currently, as well as with this proposed legislation, any driver that is operating a vehicle under the influence of Cannabis, and is proven as such, will be treated the same as someone who is under the influence of alcohol, or any other drug. “Canada treats both types of DUI the same. However, they are different in the way police investigate DUIs involving drunk driving. The police can use the breath test to determine the amount of alcohol in a person’s system. However, a breath test cannot determine marijuana consumption.  As such, the police have to conduct a DUI marijuana suspicion differently,” according to Donna V. Pledge B.A. LL.B. Considering that the punishments are the same, what are they? “Both hybrid [alcohol, or other drug] offenses would be punishable by mandatory penalties of $1,000 for a first offense and escalating penalties for repeat offenders (e.g., 30 days imprisonment on a second offense and 120 days on a third or subsequent offense).

The maximum penalties would mirror the existing maximum penalties for impaired driving. These would be increased in Part 2 to two years less a day on summary conviction (up from 18 months), and to 10 years on indictment (up from 5 years). The latter would make a dangerous offender application possible in appropriate circumstances,” according to  Of course, if there are injuries involved, penalties will go up quite quickly, which we will review in a little. So when it comes down to it, the actual DUI is the same, as well as the charges that go along with it, but where it differs is how one is found guilty of a DUI. Testing for Marijuana in someone’s system is a very different process than for alcohol. So keeping that in mind…

How does Law Enforcement Test for Cannabis Intoxication?

Marijuana leafCurrently, there are various methods of testing the level of alcohol in someone’s blood, and it is this level that determines the legal limit. With Cannabis, it’s not so easy. Many nations, etc., struggle with the ability to actually determine whether someone is under the influence of Cannabis to the point where it matches the definition of driving under the influence. The reason for this, is that while it is pretty safe to say that someone who as a blood alcohol level of .08 is intoxicated, the levels of THC in someone’s blood in no way indicates how intoxicated they are; especially at the time said test could be administered. So that leaves officers to the following course when it comes to Cannabis intoxication. If an officer believes that an individual is too stoned to drive, which would mean they are showing signs of unsafe driving, and pulls them over; the following will happen. Prior to April 2017, all that would be done is that the officers would administer a field sobriety test, that is uniform, and set by the government, this is the same test that those suspected of alcohol would take. However, while this may still be done, there is a new test that shows whether or not the substance in question was recently used, by using a field oral swab test. This test can only be administered however if the officer has due cause.

This differs, where officers can have anyone, at any time perform a breathalyzer. If the swab is positive, and depending on the results of the field sobriety test, you may then be taken in for a blood test that you can refuse for a $2,000 fine instead. This of course does not get you out of the charge, only gives the officers that much less empirical evidence to go off of. It is then using these test results, where the level of THC is in the blood is determined to prosecute, and to determine the punishment. Meaning, if you are not intoxicated, regardless of the levels of THC in your system, you should never get to the blood test step of the process. This is of course to help preserve the innocence of those who may consume Cannabis legally, and do not operate a vehicle while they are unable to, and thus still have THC in their system. However, if you do get to the point where you are receiving a blood test, the following punishments could be levied against you by the Crown.

What Happens After Conviction?

Of course, in a modern day nation such as Canada, punishments tend to fit the crime. So in order for this to apply to such a scenario as a Cannabis DUI, in the eyes of the law the severity of the crime all depends on the level of THC in one’s blood stream. There are three distinct, and separate levels of THC intoxication which garner different punishments. The levels are separated by the amount of THC, measured in Nano grams, per ml of blood, within two hours of driving.

  1. Between 2-5NG of THC:
    1. This is punishable only by a fine, and is a lower level offense. Maximum fine of up to $1,000 for a first time offense.
    2. Jail time for a second offense
    3. Longer jail time for a third, and so on.
  2. Over 5 ng of THC:
    1. This is a “hybrid offense” which can be prosecuted as indictment cases, or in less serious offenses, a summary conviction.
    2. Associated fines
    3. Jail time up to 10 years depending on the circumstance.

Alcohol and THC:

  1. Having a blood alcohol concentration of 50 milligrams (mg) of alcohol per 100 ml of blood, combined with a THC level greater than 2.5 ng per ml of blood within two hours of driving would also be a hybrid offense.
  2. These charges would mirror those of any hybrid offense, including large fines, and jail time depending on the circumstance.
  3. The circumstance of the conviction really will determine the level of punishment that will follow.


As Cannabis becomes more and more common place in our modern world, we have to find ways to assimilate it into our everyday practices. Already in Canada, deaths from DUI are the highest rated reasons for death and injury; so it is a very serious problem that must be tackled, and not allowed to get worse. With a rising amount of people consuming Cannabis and possibly being on the road, it is imperative to educate the public to the dangers of driving while intoxicated. While these extra precautions open the door to inaccurate test results, and difficulty determining intoxication, it’s always the right, and safe bet to just never drive while intoxicated.


  1. Police to get sweeping authority in impaired driving overhaul – The Globe and Mail
  2. DUI means weed now, too – NOW Magazine
  3. Driving Under the Influence of Marijuana – Donna V. Pledge, Toronto Criminal Lawyer
  4. Backgrounder: Changes to Impaired Driving Laws –
  5. The effect of cannabis compared with alcohol on driving
  6. Scientists Still Seek A Reliable DUI Test For Marijuana

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