Your Rights During a DUI Stop in Canada: What Police Can and Cannot Do

Being pulled over by police is stressful enough, but when you suspect it’s related to impaired driving, knowing your rights becomes crucial. Many Canadians unknowingly waive their constitutional protections during DUI stops simply because they don’t understand what police can and cannot legally do. This guide explains your Charter rights and the boundaries of police authority during impaired driving investigations.

Your Charter Rights at a DUI Stop

The Canadian Charter of Rights and Freedoms provides critical protections during police interactions, and these rights don’t disappear when you’re suspected of impaired driving.

Section 10(b): Right to Counsel

The moment police arrest or detain you, which includes making a breath demand, you have the constitutional right to speak with a lawyer without delay. Police must:

• Inform you of this right immediately
• Provide you with a reasonable opportunity to contact a lawyer
• Refrain from questioning you or eliciting evidence until you’ve had that opportunity

However, this right has practical limits. If you’re given a roadside screening demand (the portable breath test), you must comply immediately before speaking with counsel. The right to a lawyer applies after you provide the roadside sample, or when police make a formal demand for breath samples at the station.

Section 9: Freedom from Arbitrary Detention

Police cannot randomly stop vehicles without lawful justification. They need reasonable grounds to pull you over, such as:

• A traffic violation
• A RIDE program checkpoint (legally sanctioned random stopping)
• Reasonable suspicion you’ve committed an offence

A stop based solely on racial profiling or without any legal justification violates your Charter rights and can lead to evidence being excluded.

What Police Can Do During a DUI Investigation

Understanding police powers helps you recognize when officers are acting within their authority.

Mandatory Alcohol Screening (MAS)

Since December 2018, police in Canada have had expanded powers under Section 320.27 of the Criminal Code. An officer can demand a roadside breath sample even without reasonable suspicion of alcohol consumption. This “mandatory alcohol screening” applies to any lawful traffic stop.

You must comply with this demand immediately. Refusal carries the same criminal penalties as impaired driving itself, a minimum fine of $2,000 for a first offence.

Approved Screening Device (ASD) Demands

If police have reasonable suspicion you’ve consumed alcohol (smell of alcohol, red eyes, slurred speech), they can demand you provide a breath sample into an approved screening device at the roadside.

Breath Demand at the Station

If you fail or refuse the roadside test, police can demand you accompany them to the station to provide breath samples into an approved instrument (the more sophisticated breathalyzer). This demand must be made “as soon as practicable”, typically within two hours of driving.

Standardized Field Sobriety Tests (SFST)

Police can request you perform physical coordination tests if they suspect drug impairment. While technically voluntary, refusal creates additional suspicion and may lead to arrest.

What Police Cannot Do

Police authority has limits, and violations can result in charges being dismissed.

Cannot Force You to Answer Questions

Beyond providing your licence, registration, and insurance, you have the right to remain silent. Police cannot compel you to answer questions like:

• “How much have you had to drink?”
• “Where are you coming from?”
• “Have you used any drugs today?”

Politely decline: “I’m exercising my right to remain silent.”

Cannot Search Your Vehicle Without Grounds

Unless police have reasonable grounds to believe your vehicle contains evidence of an offence, they cannot search it without your consent or a warrant. Never consent to a search.

Cannot Delay Your Access to Counsel Unreasonably

Once at the station, police must provide you with a telephone and privacy to speak with a lawyer. Delays beyond what’s reasonably necessary violate your Section 10(b) rights.

Cannot Continue Testing After Unreasonable Delays

Breath samples must be taken “as soon as practicable.” Delays beyond two hours require the Crown to explain why. Significant unexplained delays can invalidate the evidence.

When Evidence Gets Excluded

Charter violations don’t automatically mean your case gets dismissed, but they can lead to exclusion of evidence under Section 24(2) of the Charter. Courts consider:

• The severity of the Charter violation
• The impact on your Charter-protected interests
• Society’s interest in an adjudication on the merits

Serious violations, like denying you access to counsel or conducting an illegal search, frequently result in evidence exclusion, which often leads to charges being withdrawn or dismissed.

What You Should Do During a DUI Stop

1. Remain calm and polite. Aggressive behaviour helps no one.
2. Provide your documents when requested (licence, registration, insurance).
3. Comply with breath demands. Refusal carries criminal penalties.
4. Exercise your right to silence beyond basic identification.
5. Assert your right to counsel clearly: “I want to speak with a lawyer.”
6. Document everything you remember as soon as possible.
7. Contact legal counsel immediately. Whether you need a DUI lawyer in Toronto such as Karapancev Law or elsewhere in Ontario, early legal advice is critical for protecting your rights and building your defence.

The Bottom Line

Your Charter rights remain in force during DUI investigations, but they’re nuanced. Police have significant powers to investigate impaired driving, but those powers have constitutional limits. Understanding where your rights end and police authority begins can mean the difference between a conviction and a successful defence.

If you’ve been charged with impaired driving, the evidence against you may not be as solid as it appears. Police procedure violations, Charter breaches, and technical defences exist in many cases, but only experienced legal counsel can identify and pursue them effectively.

Disclaimer: This article provides general legal information about DUI stops and Charter rights in Canada. It does not constitute legal advice. Laws and procedures are subject to change, and every case has unique circumstances. If you’ve been charged with impaired driving, consult with a qualified criminal defence lawyer immediately.