There is no legal difference between DUI and DWI in Canada — neither term exists in Canadian law. Both are American abbreviations, and Canada does not use either one to lay a charge. Everything people call a "DUI" or a "DWI" is prosecuted under the Criminal Code as an impaired driving offence : impaired operation, "over 80," drug-impaired driving, refusal, and care or control. The label you use makes no difference; the consequences — a criminal record, a driving prohibition, and possible jail — are the same.
That gap between the everyday language and the actual law matters. Because "DUI" and "DWI" are borrowed from U.S. states, many people in Toronto assume Canada has different tiers of drinking-and-driving charges, or that one is "less serious" than the other. In reality, Canadian impaired driving law is broad and strict, and the terminology tells you nothing about how exposed you are.
In the United States, the exact wording varies by state. "DWI" usually stands for driving while intoxicated (or impaired ), "DUI" for driving under the influence , and some states add "OWI" ( operating while intoxicated ). A few states treat DUI and DWI as separate offences with different thresholds. That is a U.S. distinction , not a Canadian one.
Canada does not split hairs between "under the influence" and "while impaired." All of that conduct falls under a single framework: impaired driving offences under the Criminal Code . Historically Canada used phrases like " driving while impaired ," but modern legislation replaced that language with a broader idea of impairment by alcohol, a drug, or a combination of the two , regardless of the substance involved.
Today the law does not care what you call it. What matters is:
If someone is arrested for what they'd call a "DUI," they are typically charged under one or more offences in Part VIII.1 of the Criminal Code .
Impaired operation ( s. 320.14(1)(a) ) — operating a conveyance while your ability to do so is impaired to any degree by alcohol or a drug. This is based on the officer's observations of impaired ability.
"Over 80" (s. 320.14(1)(b)) — having a blood alcohol concentration at or above 80 mg of alcohol per 100 mL of blood within two hours of driving. This is a stand-alone offence; you can be convicted on the reading alone, even without obvious signs of impairment. (Ontario also imposes shorter-term "warn range" penalties between 50 and 80 mg, but those are provincial, not criminal.)
Drug-impaired driving (s. 320.14(1)(c)) — having a prohibited blood drug concentration within two hours of driving, or impairment shown through drug-recognition evaluations, screening devices, or blood analysis.
Refusal to comply ( s. 320.15 ) — refusing or failing to comply with a lawful demand for a breath or blood sample.
Care or control — being in a position to set a vehicle in motion while impaired, even if you were not driving (explained below).
These are all criminal offences whether someone calls them DUI, DWI, or impaired driving.
One of the most misunderstood parts of Canadian impaired driving law is care or control . Under the 2018 reforms, Parliament folded that concept into the single defined term operate — so the risk did not go away; it was built into the offence itself.
You can be charged even if:
If police believe you had the ability to set the vehicle in motion while impaired — for example, sitting in the driver's seat with the keys accessible — that can be enough.
"Many people assume they are safe if they are not driving. In law, that assumption is often wrong. Care or control charges are common and frequently misunderstood." — Jeff Mass
Impaired driving is one of the most strictly enforced offences in Canada, with mandatory minimum penalties that a judge cannot go below.
Minimum consequences (first offence):
Additional consequences can include:
A conviction can also reach well beyond the roadside — including how an impaired driving charge affects employment . Repeat offences, or cases involving bodily harm or death, carry substantially higher penalties, including significant jail time.
Some people assume drug impairment is treated more leniently than alcohol. Legally, both fall under the same framework in section 320.14. The practical difference is in the evidence : drug-impaired cases often rely on police observations, standardized field sobriety tests, and drug-recognition expert (DRE) evaluations, which makes them highly fact-driven and frequently contestable.
Refusing to provide a breath sample is not a way to avoid a charge — it is a separate criminal offence under section 320.15. In many cases, refusal carries penalties equal to or greater than those for impaired driving itself.
"Refusal cases are often more complex than people expect. What seems like a simple decision in the moment can carry the same — or greater — consequences than a conviction for impaired driving." — Heather Spence
Whether you call it DUI, DWI, or impaired driving has no legal effect. What actually decides a case is the evidence the police collected, whether your Charter rights were respected, the reliability of the testing procedures, and how the Crown builds its case. Impaired driving cases are usually won or lost on technical and evidentiary grounds — including the defences counsel raise against breath results, Charter breaches, and Crown proof — not on labels.
Impaired driving cases are highly technical. The evidence may include breathalyzer calibration records, the timing of samples, police notes, and roadside-testing procedures — and errors in any of these can change the outcome, but only if they are spotted early. Acting quickly lets counsel preserve disclosure issues, assess possible Charter breaches, challenge testing procedures, and build a defence before positions harden. Demands, breath tests, and release conditions unfold quickly after a stop, so understanding the DUI arrest process in Ontario helps — but the critical step is getting advice before you speak to police or provide further samples.
If you have been charged with what's commonly called a DUI in the Greater Toronto Area, the defence lawyers at Mass Tsang can help you understand your options. Their approach focuses on technical defence, evidentiary analysis, and protecting your long-term interests — not just resolving the immediate charge. Speak to a lawyer before taking any further steps.
There is no legal difference. Canada does not use "DUI" or "DWI" — both are U.S. terms. All such conduct is prosecuted as impaired driving under the Criminal Code .
"DUI" is not a legal term, but its Canadian equivalent — impaired driving — is a criminal offence that can result in a fine, a driving prohibition, and imprisonment.
The common charges are impaired operation, "over 80" (80+ mg of alcohol per 100 mL of blood), drug-impaired driving, refusal to provide a sample, and care or control of a vehicle while impaired.
Yes. Under "care or control," you can be charged if you had the ability to set the vehicle in motion while impaired — even if it was parked and switched off.
Refusal is a separate criminal offence under section 320.15 and often carries penalties equal to or more severe than impaired driving.
Both fall under the same legal framework (section 320.14), but drug cases tend to rely more on police observations and expert evaluations, which can make the evidence more contestable.
Penalties include a mandatory minimum fine (at least $1,000 on a first offence), a driving prohibition, a criminal record, higher insurance costs, and — in serious or repeat cases — jail.
Yes. A criminal record for impaired driving can restrict travel (especially to the U.S.) and affect employment.
Get legal advice before giving a statement. What you say can be used as evidence and may weaken your defence.
