Back in 1975, the Supreme Court of Canada made a groundbreaking decision on drunk driving. The decision was about the admissibility of breathalyzer test results presented in court. In this decision, the Court held that breathalyzer results, even absent evidence the breath sample was lawfully obtained, could still be used in court to convict a driver for being over the blood alcohol limit, with this caveat: as long as the driver did in fact provide a breath sample, and a certificate of analysis was admitted into evidence.
In plain English, what the court was saying is that if you provided a breath sample, even if the demand for the breath sample was unlawful, the results of that breath test could be used against you in court.
Since then, courts across the country have gone back and forth about whether that decision remains good law or whether it's absolutely bonkers that unlawfully obtained evidence is somehow still admissible in court.
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