Drug charges against three men have been thrown out after a judge ruled that a Toronto police officer had been “deliberately misleading” in his testimony and notes in an attempt to “strengthen the case” against one of the accused.

Const. Bradley Trenouth “falsely attributed” a large piece of crack to Toronto man Jason Jaggernauth, Judge Katherine Corrick wrote in her Aug. 8 decision, staying the charges against Jaggernauth.

Because of Trenouth’s actions, Corrick excluded evidence gathered by him and other officers from the trial of Jaggernauth’s co-accused, leading the judge to find them not guilty in the same decision.

“The false attribution of evidence to an accused’s possession, and false testimony by a police officer constitute precisely the type of state misconduct that undermines the integrity of the judicial process,” Corrick wrote.

Jaggernauth, Jordan Davis and Jimal Nembrand-Walker were charged with possession of cocaine for the purpose of trafficking and possession of the proceeds of crime in 2014, after police found them in a Scarborough apartment that contained multiple types of drugs and drug paraphernalia.

Police officers found several grams of crack on Davis and crack, powdered cocaine and other drugs in Nembrand-Walker’s pockets at the time of the arrest, Corrick wrote in her decision.

Police did not find any drugs on Jaggernauth, Corrick said.

Trenouth testified in a pretrial hearing that he saw a large piece of crack fall from Jaggernauth when officers got Jaggernauth to stand up from his chair — testimony that was backed up by the notes Trenouth said he took at the time of Jaggernauth’s arrest, according to the judge’s decision.

But at the trial several months later, Trenouth told the court that he did not see the crack fall from Jaggernauth, Corrick wrote. Instead, Trenouth testified that he found the piece of crack on the floor near Jaggernauth and assumed it had fallen from him.

Corrick noted other discrepancies between Trenouth’s pretrial and trial testimonies in her decision.

At the preliminary hearing, Trenouth said he picked the large ball of crack off the floor after forensic officers had taken photos of the scene. But the photos taken do not include images of that specific piece of crack, Corrick wrote.

Trenouth told the court that might be because the piece of crack had been moved or stepped on before the photos were taken.

The large piece of crack was also missing from evidence photos taken by police about three hours later, in Trenouth’s presence, the judge said.

Trenouth’s story changed at trial, where he said there were no photos of the piece of crack because he had already picked it up and put it in his pocket before the photos were taken, Corrick wrote.

Corrick ruled on Aug. 8 that Trenouth did not find the crack near Jaggernauth, as the police officer had claimed.

“I have concluded that Officer Trenouth was deliberately misleading when he prepared his notes and testified at the preliminary hearing, in an effort to strengthen the case,” Corrick wrote.

It is unlikely that Trenouth, who has eight years of police experience, would pick up unwrapped drugs and put them in his pocket at a crime scene, Corrick said.

And if Trenouth had merely been mistaken in his pretrial testimony, he should have informed the Crown before the case went to trial, the judge added.

An investigation should be immediately opened into Trenouth’s conduct in the case, Jaggernauth’s lawyer Chris O’Connor said in an interview.

“The bottom line is . . . an officer falsely attributed an exhibit to my client that never was on my client,” O’Connor said.

Toronto police spokesperson Meaghan Gray said she “can’t say whether (Trenouth) will face any discipline.” All disciplinary matters are confidential until the officer in question has appeared before a police services tribunal, Gray added.

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“Generally speaking an investigation into allegations of an officer providing false evidence in court could lead to criminal charges (such as) perjury or (internal) discipline under the Police Services Act,” Gray said.

Corrick was scathing in her decision about the effects of Trenouth’s false testimony.

“It is difficult to imagine how public confidence can be maintained in the rule of law when police officers present false evidence against accused persons,” Corrick wrote. “Our justice system cannot function unless courts can rely on the willingness of witnesses to . . . tell the truth.”