CBC News has raised serious questions about an expert witness in a high-profile child-abuse case.

In a scathing 1,088-paragraph decision last year, B.C. Supreme Court Justice Paul Walker accused the Ministry of Children and Family Development of "reckless disregard" in allowing a father unescorted visits to his four children.

The judge also concluded that the father had sexually abused one of his daughters. No charges were laid.

In addition, the ruling criticized a senior ministry official for contacting the Vancouver Police Department sexual-offences unit to "disparage" the mother's mental health and truthfulness.

All of this caused an uproar in the B.C. legislature.

But in an appeal, the father's lawyer, Morgan Camley, claimed that an expert witness, psychologist Claire Reeve, has degrees from "diploma mills" and engages in "junk science", which the judge allegedly relied on in writing his decision.

CBC News reporter Eric Rankin has reported that Reeves "believes many people have had controlling microchips implanted in their brains—and have been given trigger words that could turn them into assassins".

Reeves did not make herself available to CBC News to reply to Rankin's report.