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But, said Justice Deborah Calderwood, she wasn't "wholly convinced" about Officer Kassandra Harrison's innocence.

"My conclusion is that I'm left with a reasonable doubt," said the judge about a text sent by Harrison that began with "If you want to lie ..."

"But just because I'm left with a reasonable doubt, doesn't mean I'm wholly convinced. I'm not."

The judge used Harrison's trial to exhort all police officers to own their mistakes in "honesty and integrity".

"Officers who lie, or suggest lying, diminish the profession as a whole. That type of conduct is dangerous and is never acceptable," Calderwood said.

The judge acknowledged the difficult job done by police, saying they are required to make on-the-spot decisions, often without a chance to consult others or do research.