Ontario.An officer at your car window is a moment that moves fast, and almost no one reads the rules in advance. The law is actually fairly clear about what you must do, what you can decline, and where your rights switch on. This is the plain version. It is general information about Ontario and Canadian law, not legal advice about your case. If something has happened to you, talk to a lawyer.

Keep this in your glovebox: we made a free, printable pocket card of these rights. Print it, fold it, keep it on hand.

Do you have to stop and lower your window?

If you are driving and an officer signals you to stop, yes. Section 216 of Ontario's Highway Traffic Act requires a driver to stop when signalled by a police officer. Lower the window enough to speak and hand over documents. When you are driving, you must produce your licence, your vehicle registration, and proof of insurance on request. That part is not optional.

Do you have to answer their questions?

Beyond identifying yourself as the driver and producing those documents, no. You are not required to answer investigative questions like where you are coming from, where you are going, or whether you have had anything to drink. You have the right to remain silent. You can say, politely, that you would rather not answer questions. Staying calm and brief is usually wiser than arguing, but the choice to stay silent is yours and it is protected.

Can they make you take a breath test?

At the roadside, often yes, and this surprises people. Since December 2018, Canada has had mandatory alcohol screening. If you have been lawfully stopped and the officer has an approved screening device with them, they can demand a roadside breath sample without first needing a reason to suspect you have been drinking. Refusing that demand is itself a criminal offence under section 320.15 of the Criminal Code, and it carries penalties as serious as impaired driving. This is the roadside screening test. The longer, more formal breath test at the station is a separate step with its own rules, including your right to a lawyer.

You can decline to answer questions. You cannot, as a rule, decline a lawful roadside breath demand. Knowing which is which is the whole difference.

Can they search your car?

Not just because they stopped you. A traffic stop does not give police a free hand to search your vehicle. To search, they generally need one of a few things: your consent, a warrant, reasonable grounds connected to an offence, or a search that is a lawful incident of an arrest. You can decline to consent to a search. Declining is not an admission of anything, and it is your right. If they search anyway, do not physically resist. Say clearly that you do not consent, remember what happened, and raise it later with a lawyer. An unlawful search can be challenged in court under section 8 of the Charter, which protects you against unreasonable search and seizure.

What if they say you are detained or arrested?

This is the line that changes everything. You are allowed to ask, plainly, "Am I being detained?" or "Am I free to go?" If you are not being detained, you can leave. If you are detained or arrested, two rights switch on immediately under section 10 of the Charter. You have the right to be told why. And you have the right to speak to a lawyer without delay, in private, before answering questions. Say it out loud and say it clearly: "I want to speak to a lawyer." Then stop talking until you have. That sentence, and the silence after it, is the most important protection you have, and on the record it matters enormously whether you asked for it.

What if the car is parked and you are not driving?

The driving rules above hinge on you actually operating a vehicle. If you are parked and not driving, the obligation to produce a licence on demand is not automatic in the same way, and the power to stop you under the Highway Traffic Act may not apply at all. Police can still approach and speak to you, and you can still choose whether to engage. The same line still governs the encounter: you can ask whether you are being detained, you can decline to answer questions, and if you are detained or arrested, your right to a lawyer switches on. Whether a person sitting in a stationary car is even "operating" it for the purposes of an impaired charge is a contested legal question, and it has decided real cases.

The one sentence to remember

If you take nothing else from this: stay calm, produce your documents if you are driving, do not consent to a search you do not want, and the moment you are detained or arrested, say "I want to speak to a lawyer" and then stop talking. You do not have to win the argument at the roadside. You have to protect the record, so that a lawyer can win it later.

This guide explains general principles of Ontario and Canadian law as of 2026. It is journalism, not legal advice, and it cannot account for the facts of any particular stop. If you are facing a charge or believe your rights were breached, speak to a lawyer or a community legal clinic.