Drug-impaired driving

Drugs can impair your ability to drive safely and increase the risk of getting into a collision. In fact, cannabis increases your chance of a car accident Footnote 1. The percentage of Canadian drivers killed in vehicle crashes who test positive for drugs now actually exceeds the numbers who test positive for alcohol Footnote 2.

Impaired driving is the leading criminal cause of death and injury in Canada, and drug-impaired driving is increasing.

Getting behind the wheel while impaired by drugs is not only dangerous, it’s against the law. Trained police officers or Drug Recognition Experts can determine if you are under the influence of a drug and can charge you with impaired driving. You can have your license suspended, face fines, criminal charges, and even jail time.

How cannabis impairs drivers

Cannabis can impair each person differently. The impairment on individuals can depend on:

  • The method of consumption, for example how cannabis was consumed (smoked, inhaled, ingested);
  • The quantity of cannabis consumed ;
  • The variety of cannabis and its THC levels, including cannabis prescribed for medical use.

As a result, there is no guidance to drivers about how much cannabis can be consumed before it is unsafe to drive or how long a driver should wait to drive after consuming cannabis.

Don’t take a chance. Don’t drive high.

How Cannabis affects your ability to drive

When you drive a vehicle, you need to be alert and focused. Consuming even small amounts of cannabis affects your ability to react and increases your chance of being in a crash. Drugs impair your ability to drive by:

  • affecting motor skills;
  • slowing reaction time;
  • impairing short term memory and concentration;
  • causing drivers to vary speed and to wander; and
  • reducing the ability to make decisions quickly or handle unexpected events Footnote 3.

Cannabis is not the only drug that affects your ability to drive. Other drugs, including cocaine or even prescribed drugs, such as opioids also pose a significant risk to your safety and the safety of your passengers, other drivers, cyclists, and pedestrians. Over-the-counter medications may also impair your ability to drive.

How to plan ahead

There is no good excuse for driving while impaired, and being a passenger with an impaired driver is also risky. You have options:

  • Make sure you have a designated driver.
  • Call a friend or loved one to pick you up.
  • Take public transit.
  • Call a cab or a ridesharing service.
  • Stay over.

How police protect our roads from drug-impaired drivers

Police are trained to detect if you are driving under the influence of a drug and enforce drug-impaired driving laws using:

In addition to these tests, the new legislation permits law enforcement to use approved drug screening devices to detect the recent presence of several drugs, including any or all of THC from cannabis, cocaine and methamphetamine. Following a legal roadside stop, police can demand an oral fluid sample and/or conduct an SFST if they suspect you are driving under the influence of a drug.

How drug-impaired driving laws are enforced

Drug-impaired driving has been illegal in Canada since 1925. In addition to risking your life and the lives of others, you could face serious consequences such as having your license suspended, fines, criminal charges or even jail time if you are convicted of driving under the influence of cannabis or other drugs. There are over 14,400 trained SFST officers across Canada (April 2018) and 1,082 certified DREs (February 1, 2021). This number will continue to increase as the federal, provincial and territorial governments invest in additional training.

Information for parents

Young people continue to be the largest group of drivers who die in crashes and later test positive for alcohol or drugs, and yet, only 11 percent of parents surveyed said they had discussed the risks of driving under the influence with their teenagers Footnote 4. This dropped to 4 percent when teens themselves were asked whether they had discussed impaired driving with their parents.

Start a conversation with your children about impaired driving. It could save lives.

Government of Canada initiatives on drug-impaired driving

Public Opinion Research on Drug-Impaired Driving

Driving under the influence of drugs is a major contributor to fatal road crashes in Canada and young people continue to be the largest group of drivers who die in crashes and test positive for drugs.

The Government of Canada’s drug-impaired driving public awareness campaign communicates to Canadians the risks associated with driving under the influence of cannabis and other drugs. This campaign is informed by recent public opinion and qualitative research.

Public Safety Canada conducted research Footnote 5 with Canadians on drug-impaired driving in 2017. A summary of the findings shows that:

  • 81% know someone who has used cannabis and 56% have consumed cannabis at some point in their lives
  • Among those who have used cannabis, 28% reported they have operated a vehicle while under the influence
  • One in three Canadians report that they have ridden in a vehicle operated by a driver who was under the effects of cannabis
  • Among those who have driven while impaired, 4 in 10 downplayed the risks by either indicating that driving while under the influence of cannabis is less dangerous than driving while under the influence of alcohol (25%) or that driving while under the influence of cannabis poses no real risk (17%)
  • 65% agree that cannabis users often fail to realize that they are impaired from using cannabis, and 25% believe that the impacts of cannabis consumption are less detrimental to driving ability than alcohol
  • 45% of youth (aged 16-24) report using cannabis, with the majority reporting they used it in the past 12 months
  • 22% of youth who have used cannabis said they drove while impaired and most said they did it because they don’t think it’s as dangerous as drunk driving
  • 1 in 3 youth have been a passenger with a cannabis impaired driver
  • 44% of youth say it is easy to tell if someone is too high to drive

Public Safety Canada Working with Partners to Combat Drug-Impaired Driving

Public Safety Canada is working federal, provincial and territorial partners and with road safety advocates to help raise awareness of the dangers of driving while impaired by cannabis or other drugs including:

Mothers Against Drunk Driving (MADD) Canada

Young Drivers of Canada

Canadian Automobile Association

Canadian Association of Chiefs of Police

Fast facts about drug-impaired driving (DID)

PDF Version


Video length: 2 minutes 29 seconds.

(TEXT ON SCREEN: In 1999, Gregg’s son was killed in a car crash.)

(TEXT ON SCREEN: The driver was high.)

It all started off with a group of them heading up to Bennett Lake just outside of Perth.

And they were celebrating the end of school, they were all graduating.

One of the young men attempted to pass the other cars they were in the convoy with and it struck a truck head on.

So we got that knock on the door that obviously no other parent wants to get,

to let us know that Stan wouldn’t be coming home.

Madison was 13 when her older brother was killed.

And about two months after Stan had been killed, I was driving around with Madison.

I asked her point blank, I said “why did Stan get in that car?

I thought your Mom and I taught you well about impaired driving.”

And she was amazing for a 13 year old, she said

“you did – you taught us well about alcohol, but not about drugs.”

If you take a look at the 50 years that Canada has really been front on fighting impaired driving, it’s all been alcohol.

So what we have with specifically with marijuana as a drug, it’s the opposite impact, isn’t it?

But the end game is the same, you’re still impaired.

And we don’t even recognize it. Kids, youth, don’t even recognize it yet,

that it a true impairment.

It was several years before I could legitimately get myself out of bed properly.

My job is to protect my family, and I didn’t.

I failed in educating my children properly about what the risks were that they are facing.

You really really need to listen. And you really really need to watch.

Because this is real.

I mean, drugged driving does kill.

I can sit here in front of you, I’m the testament to that.

(TEXT ON SCREEN: Your life can change in an instant)

(TEXT ON SCREEN: #dontdrivehigh)

(Canada wordmark)


I have witnessed on many occasions the effects of drugs on driving abilities.

Many symptoms can occur depending on the substance consumed: drowsiness, the augmentation of risky behaviour, or aggressiveness at the wheel.

There is no excuse for driving under the influence of drugs. Many options are available to you -

have a designated driver, call a friend or take a taxi. Make sure you come home safely and help us protect lives.


Every year, the Toronto Police Service arrests approximately 1400 impaired drivers.

The vast majority of those are impaired by alcohol. But the impaired driving landscape is changing.

We are seeing more and more impaired-by-drug drivers every year.

The message is clear: you, as a driver, have a responsibility to operate a motor vehicle safely and while not impaired by drug or alcohol.

Passenger: if you’re in a motor vehicle and you see somebody who is or is about to operate a motor vehicle while impaired,

take responsibility for your own safety – call 911.

The message is clear: there is no excuse to operate a motor vehicle while impaired by drug or alcohol.

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