Open Court Principle vs. Privacy: The Jhon Plazas Castillo Breathalyzer Ruling in Canada

• by Shimanta Das
• August 26, 2026

In a recent ruling that has sparked debate across Canada, the courts have addressed the tension between the open court principle and the right to privacy, particularly in the context of breathalyzer evidence. The case, involving Jhon Plazas Castillo, has brought to light critical questions about the admissibility and publication of evidence in criminal trials. At the heart of the matter is a video showing a defendant at an Elgin Street cellblock for a breath test, which the defence argued should not be published or broadcast despite being presented at trial. This ruling has significant implications for how evidence is handled in the digital age.nnThe open court principle, a cornerstone of Canadian justice, ensures that court proceedings are transparent and accessible to the public. It serves four key objectives: maintaining the integrity of the judicial system, promoting public confidence, ensuring fair trials, and allowing for public scrutiny of the administration of justice. In local democracies, this principle is vital because it empowers citizens to hold the justice system accountable. Without it, there is a risk of secret justice, which can erode trust and lead to abuses of power. The ruling in the Castillo case underscores the delicate balance courts must strike between this transparency and an individual’s right to a fair trial and privacy.nnHowever, the ruling also touches on a broader issue: the reliability of breathalyzer machines. In a related development, breathalyzer machines in Ontario are being questioned after a court ruling that highlighted concerns about the accuracy of these devices. The Supreme Court of Canada has weighed in on the 2018 amendments to the Criminal Code, which have been the subject of significant judicial debate. The majority opinion, authored by Justices Malcolm Rowe and Mary Moreau, clarified that the Crown is not required to produce evidence from the analyst who certified the alcohol standard used in the calibration check. Instead, the Crown can rely on the testimony of a qualified technician, either by certificate or viva voce testimony. This decision aims to streamline the process while maintaining the integrity of the evidence.nnFor local democracies, this ruling is a reminder of the importance of an open and accountable justice system. It also highlights the need for ongoing scrutiny of technological evidence, such as breathalyzer results, to ensure they meet the highest standards of reliability. As Canada continues to navigate