First warm nights, patios open, a long weekend ahead – and a line of flashing lights up the road. If you get waved into a spring impaired‑driving checkpoint, it helps to know exactly what officers are allowed to do, what roadside tests they can use and how fast penalties can kick in. The rules apply whether you have had a couple of beers, used cannabis, or taken medication that affects alertness.
Standardized Field Sobriety Tests (SFST) are a set of balance, eye and coordination checks an officer can use at the roadside. They are meant to help estimate whether alcohol or drugs are affecting your driving before more formal tests are ordered.
Why spring brings blitzes
Spring usually means more evening driving, more social drinking, and more riders getting motorcycles and bikes back on the road. Police services often respond with visible impaired‑driving campaigns, especially around long weekends and sports events.
Enforcement tends to focus on late afternoons, nights and early‑morning hours when crash risk from impairment is highest. You may also see more roving patrols rather than fixed checkpoints, so the chance of being stopped on a “normal” trip goes up.
What officers can do
Once you are lawfully stopped – for a checkpoint, speeding, or even a burnt‑out light – an officer can briefly talk with you and look for signs of impairment. That can include slurred speech, bloodshot eyes, smell of alcohol or cannabis, or very slow or agitated movements.
In many situations, police can demand a roadside breath test even if you seem fine, as long as the stop itself is legal. This small hand‑held device is a screening tool that gives a quick reading; if it shows you in a “warn” range or over the legal limit, expect immediate consequences.
If the officer suspects drug impairment, you can be asked to perform SFST at the roadside. That usually means following a pen with your eyes, walking heel‑to‑toe in a straight line and standing on one leg while counting. You might also be asked for an oral fluid sample (a saliva swab) that can show recent use of substances like THC or cocaine.
A common myth is that you can simply refuse these tests and accept a small suspension. In reality, refusing a legally ordered breath, oral fluid or blood test is typically a separate criminal offence with penalties similar to, or sometimes harsher than, a fail result.
Penalties and real‑world costs
Canada uses a mix of roadside administrative penalties and Criminal Code charges. Even at a low “warn” range for alcohol, provinces and territories can issue an immediate licence suspension, usually from a few days up to several weeks, plus towing and storage costs for your vehicle.
If you blow over the legal limit, show clear signs of impairment, refuse a test, or drive while already suspended, you are likely looking at a criminal charge. That can mean losing your licence for many months or longer, fines that can climb into the thousands, and mandatory education or treatment programs.
Repeat offences, high readings, or collisions with injuries push penalties higher again. You may face vehicle impoundment, ignition interlock (a breath‑test device wired to the starter) for a year or more, and a criminal record that can complicate travel and job prospects for years.
The financial hit rarely stops with the ticket or court fine. Insurance premiums after an impaired‑driving conviction or serious roadside suspension can jump by 50–200% and stay high for several renewals. Many drivers also underestimate costs like taxis for months, licence reinstatement fees and lost income if they cannot commute.
A frequent mistake is assuming “it’s legal” means “it’s safe to drive.” Cannabis, sleep aids, anxiety meds, and even strong allergy pills can impair you enough to trigger roadside tests, especially if combined with alcohol or fatigue.