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Impaired driving (DUI / DWI)

Region: Ontario Answer # 773

What is considered impaired driving?

Under section 320.14 of the Canadian Criminal Code, impaired driving, also commonly known as DUI (driving under the influence) or DWI (driving while impaired or driving while intoxicated) means operating a vehicle while:

  • having consumed alcohol or drugs, or a combination of the two,
  • your ability was affected to any degree by alcohol or drugs.

A driver does not have to exceed the legal blood-alcohol, or blood-drug limit to be charged with impaired driving. The only requirement for a charge of impaired driving is that your ability to drive was affected to any degree, by alcohol or drugs, regardless of how much or how little was actually consumed.

Drivers who are found to be impaired by drugs will be subject to criminal charges that carry the same penalties as driving while impaired by alcohol. If you have been charged with a criminal offence, it is important to hire an experienced criminal defence lawyer as soon as possible.


Refer to the Blood Drug Concentration Regulations to view the listed drug categories and limits. For specific information on cannabis-impaired driving, refer to our Cannabis Law and Driving section.

Depending on the findings of the police, the test results, and the specific circumstances, a driver may be charged with one or more additional criminal driving offences, such as:

How the police assess whether you are impaired

Under the law, the police have the right to stop vehicles and ask drivers if they have consumed alcohol or drugs. Although you are not required to answer such questions, it is generally best to avoid becoming hostile with the police. You are required to provide the police with your driver’s licence, car ownership, and insurance papers.

  1. Roadside tests

You do not have the right to consult a lawyer before performing a roadside test. The police will make a judgment about your ability to drive safely based on a number of observations, tests, and samples, including:

  • your appearance,
  • your answers to questions,
  • your physical movement, and
  • whether you or your car smell of alcohol;
  • a breath-screening test for alcohol,
  • the Standardized Field Sobriety Test (SFST) – which can include examining the eyes of drivers, as well as putting drivers through a series of physical tests, and
  • an oral fluid (saliva) sample to test for drug impairment.

Mandatory roadside breath test: Under recent changes to the Criminal Code, police officers no longer need to suspect a person of impaired driving in order to demand a breath test. They can now conduct random mandatory roadside breath tests to screen for alcohol impairment. This means that drivers who are stopped for any other reason, such as a traffic violation, or a check stop, may be required to provide a breath test.

  1. Testing done at the police station or medical facility

If you are arrested and taken to the police station or medical facility for further testing, you do have the right to have a lawyer present. Further testing may include:

  • evidence from roadside tests
  • evidentiary breath-screening test
  • bodily fluid sample testing
  • Drug Recognition Evaluation (DRE)

Refusing to provide a sample or perform a test can result in being charged with the Criminal Code offence of failure or refusal to comply (s. 320.15).

Penalties for impaired driving

If convicted of impaired driving, there are penalties under both the Ontario Highway Traffic Act and the Canadian Criminal Code.

1. Penalties under the Ontario Highway Traffic Act

Drug-impaired driving: Fully licensed drivers caught driving impaired by any drug including cannabis, prescription drugs or over-the-counter medications are subject to the same penalties as alcohol impaired drivers. Previously, drug impaired drivers faced criminal charges, but did not face licence penalties and suspensions under provincial legislation.

Immediate penalties for impaired driving offences include:

  • an immediate 90-day roadside licence suspension,
  • a $550 administrative penalty,
  • a $275 licence reinstatement fee,
  • your vehicle will be impounded for seven days,
  • mandatory education or treatment program (for second or subsequent offences within 10 years), and
  • an ignition interlock condition will be placed on your licence for a minimum 6 months (for third or subsequent offences within 10 years)

Additional penalties if convicted:

  • a minimum 1-year licence suspension for a first offence
  • a minimum three-year licence suspension for a second offence within 10 years
  • a possible lifetime licence suspension for a third or subsequent offence in 10 years (which may be reduced if certain criteria are met)
  • enroll in a mandatory education or treatment program, use an ignition interlock device (for one, three or six years), and undergo a mandatory medical evaluation to determine whether you are meeting the requirements for driving in Ontario

The Ontario government has recently increased the penalties for the following other impaired driving offences:

  • registering a blood alcohol concentration of between 0.05 and 0.8 (50 – 80  milligrams of alcohol in every 100 millilitres of blood), known as the “warn range”
  • violating the alcohol and drug zero tolerance requirement for young (21 and under), novice and commercial drivers
  • failing a Standardized Field Sobriety Test (SFST)

If you are convicted of any of these offences, you will be subject to the following penalties:

First offence: Licence suspension for 3 days and $250 penalty

Second offence within 5 years: Licence suspension for 7 days and $350 penalty

  • the 7 days suspension cannot be appealed
  • the license suspension will be 3 days for commercial drivers
  • further, you must attend a mandatory education program (for a second occurrence within 10 years)

Third and subsequent offences within 5 years:

  • licence suspension for 30 days
  • $450 penalty
  • a mandatory alcohol education or treatment program (for third and subsequent offences within 10 years)
  • an ignition interlock condition will be placed on your licence for at least 6 months (for third and subsequent offences within 10 years)
  • you must submit to a mandatory medical evaluation to determine whether you meet the requirements for driving in Ontario (for fourth and subsequent offences within 10 years)

In addition to these penalties, for each time your licence is suspended, you may be subject to a $281 licence reinstatement fee.

Zero tolerance for drivers 21 and under, novice and commercial drivers

Any licensed drivers who are 21 years old and under, regardless of licence class, or novice drivers (with G1, G2, M1, or M2 licenses) caught with any alcohol or drugs (including cannabis or other drugs that can be detected by an oral screening device) in his or her system who are convicted in court, will face an additional fine of $60-$500 and an additional 30-day licence suspension. Commercial drivers (drivers of vehicles requiring an A-F class licence, vehicles requiring a CVOR – Commercial Vehicle Operator’s Registration, and road building machines) are also subject to the zero tolerance rule in Ontario.

For more information on zero tolerance and impaired driving in Ontario, visit ontario.ca.


Ignition Interlock condition

When using the Ignition Interlock Program, drivers must blow into an in-car alcohol breath-screening device that prevents a vehicle from starting if it detects a blood alcohol concentration (BAC) over a pre-set limit of 0.02 (i.e., 20 mg of alcohol per 100 ml of blood). The device is located inside the vehicle, near the driver’s seat, and is connected to the engine’s ignition system. For more information on the Ignition Interlock Program, visit ontario.ca.

Medical Cannabis users

Motorists who are legally authorized to use cannabis for medical purposes are exempt from Ontario’s zero tolerance drug rules for young, novice and commercial drivers. However, all Criminal Code driving offences will still apply. Even if you have been authorized to use cannabis by a health care professional, it is your responsibility to ensure you are not impaired while driving and that your cannabis blood level is under the prohibited limit.

2. Penalties under the Canadian Criminal Code

Penalties for a conviction of drug impaired driving and alcohol impaired driving are the same.

If you are convicted of impaired driving under section 320.14 of the Criminal Code, the minimum penalties are:

  • for a first offence, a fine of $1,000,
  • for a second offence, imprisonment for a term of 30 days, and
  • for each subsequent offence, imprisonment for a term of 120 days.

If convicted, the driver may also face:

  • a jail term of not more than two years less a day if the offence is punishable on summary conviction (less serious), or
  • imprisonment for a term of up-to 10 years, if the Crown prosecutor decides to proceed by indictment (more serious).

Licence suspension:

  • first offence: minimum 1-3 year licence suspension
  • second offence: minimum 2-10 year licence suspension
  • third or subsequent offence: 3 year-lifetime licence suspension

In addition, the driver will have a criminal record.

DUI Probation Violation

If you have been given a Probation Order for a DUI charge, and you commit a violation of anything in the Probation Order, such as failure to appear in court, possession of drugs or alcohol, or failure to complete court appointed programs, this could result in a DUI probation violation charge. This is a serious offence and you should contact a lawyer as soon as possible.

Automobile insurance

If you were at fault for an automobile accident while you were impaired, your automobile insurance policy will not cover damage to your vehicle and you may not be eligible to receive certain other benefits, such as income replacement benefits.

Get Help

To erase your criminal record, call toll-free 1-888-808-3628 or learn more at Pardon Partners. It’s easier than you think.

If you have been charged with impaired driving, contact our preferred criminal law expert Calvin Barry Criminal Lawyers.

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