Impaired Driving Limits & Penalties

How many drinks put me over the limit?

There is no safe formula — absorption turns on body mass, sex, food, timing and the pour, and people misjudge it constantly in both directions. More to the point, the law starts biting at 0.05 (warn-range suspensions) and novice drivers at zero, so the practical answer for anyone driving is closer to "none" than any drink-counting rule. If you have already been tested, work from the actual reading: which side of 80, and which side of the high-BAC tiers at 120 and 160 — those numbers set the minimums.

I blew in the warn range. Is that a criminal charge?

No — and that is exactly its design. Warn-range consequences are provincial and administrative: immediate short suspensions (Ontario: 7 days on a first occurrence as of 2026; BC: 3 to 30 days), fees, and program requirements for repeats, all without court. There is no conviction and no criminal record, but occurrences are counted and escalate, and they live on your driving record for insurers to see. Limited review routes exist provincially; the windows are short.

Can police really breath-test me without any reason?

At the roadside, effectively yes: mandatory alcohol screening authorises a demand from any lawfully stopped driver with a device on hand — the stop itself must be lawful, but no suspicion of drinking is needed. The evidentiary tests at the station still require grounds, and the whole chain (stop, demand, timing, instrument procedure, your access to counsel) is precisely what impaired-driving defences examine. Comply at the roadside; litigate in court.

Is refusing the breathalyzer smarter than blowing over?

No — the law was built to close that exact play. Refusal is its own offence with a $2,000 minimum fine (higher than the ordinary first-offence minimum), the same prohibitions, the same provincial suspensions, and often a harder story to defend. If a demand's lawfulness is questionable, the remedy is a lawyer attacking it afterward, not a refusal at the roadside creating a second charge.

Will one impaired conviction really affect immigration or US travel?

Seriously, yes. Since 2018 impaired driving is "serious criminality" in Canadian immigration law: permanent residents and foreign nationals convicted face inadmissibility consequences up to loss of status and removal — anyone who is not a citizen should treat an impaired charge as an immigration emergency and get advice before any plea. Separately, the US can refuse entry over impaired convictions, and Canadian record suspensions don't bind US border authorities. These collateral consequences often outweigh the sentence itself.