Area of Law: Cannabis Law
Answer Number: 2552
What is the difference between cannabis usage and impairment?Region: Ontario Answer Number: 2552
What is considered impaired driving due to drugs or alcohol?
You do not have to exceed the legal blood alcohol or THC blood limits to be charged with impaired driving. The only requirement for a charge of impaired driving is that your ability to drive was affected by alcohol or drugs, regardless of how much or how little was actually consumed.
According to the Government of Canada, impaired driving is the leading criminal cause of death and injury in Canada. Statistics also show that 40% of Canadian drivers killed in vehicle accidents test positive for drugs, while 33% test positive for alcohol.
Impairment by THC
Cannabis contains both CBD (cannabidiol) and THC. THC is the primary psychoactive component of cannabis that causes mind-altering effects and can impair motor or mental functions.
In contrast, CBD is the chemical component that does not get a user high and is often used for medicinal purposes.
What are the prohibited amounts of THC?
Police can conduct blood tests to determine the approximate amount of THC in your system.
Both the Ontario Highway Traffic Act and the Criminal Code set out the offences for the varying prohibited amounts of THC per ml blood. Under the Criminal Code, there are 3 new cannabis impairment offences:
- Summary conviction offence: 2 ng but less than 5 ng of THC per ml of blood.
- Hybrid offence: 5 ng or more of THC per ml of blood.
- Hybrid offence: for a combination of 50 mg of alcohol per 100 ml blood + 2.5 ng or more of THC per ml of blood.
However, cannabis can affect each person to varying degrees depending upon many factors, such as:
- how cannabis was consumed (smoked, inhaled, or ingested);
- how much cannabis was consumed; and
- what type of cannabis was consumed and its THC levels.
As well, how you consume cannabis affects how it appears in your system. For example, when you smoke or vape cannabis, you will feel the effects faster, but they may disappear between 30 minutes to 4 hours. When consuming edibles, the effects the effects may not be felt as quickly, but they will usually last between 4 to 6 hours, which is important to remember if you are planning on driving after consuming. View How long does cannabis stay in your system after consumption?
The Cannabis Act provides for oral drug screening devices that can be used by police to test for drug impairment.
Signs of impairment by THC
Consuming cannabis that contains THC can impair your behaviour and ability to drive in many ways. For example, it can:
- affect motor skills and coordination;
- delay a driver’s reaction time;
- impair both short term memory and concentration;
- cause drivers to vary speed and drive erratically;
- reduce a driver’s ability to make decisions quickly or handle unexpected events, such as a pedestrian running in front of them
Someone who is impaired by cannabis may also exhibit the following physical signs:
- rapid heart beat
- smell of cannabis
- dry mouth or shallow breathing
- red or watery eyes
If convicted of driving while impaired by cannabis or other drugs, drivers face penalties under the Criminal Code that include suspensions, fines, possible jail time, and a criminal record.
In addition, convicted drivers face penalties under the Ontario Highway Traffic Act, which include licence suspensions and fines.
For more information on drug-impaired driving offences and penalties, view What criminal laws apply to driving while using cannabis?
For legal advice and assistance with a cannabis related matter, contact our preferred cannabis law expert, Harrison Jordan Law .
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