Paediatrician David Southall has lost his bid to have the decision to strike him off the medical register overturned by the High Court in London.
The General Medical Council (GMC) struck off Dr Southall in 2007 after he accused a Shropshire mother of drugging and murdering her 10-year-old son.
It had ruled he was guilty of serious professional misconduct.
It has previously rebuked him over the case of Sally Clark, who was wrongly jailed for the deaths of her two sons.
In 2007, the GMC panel said Dr Southall had a "deep-seated attitudinal problem".
It found that his actions had added to the distress of the mother - Mrs M - following the death of her son, who hanged himself in 1996.
Dr Southall made the claim in an interview with Mrs M about the safety of her surviving son.
He had been instructed by a county council to provide an independent expert report to the court.
'Lack of insight'
During his High Court case, lawyers for Dr Southall had argued that the GMC panel had failed to give "any or adequate weight" to inconsistencies in Mrs M's evidence, and that they did not understand what child protection work involved.
But in his judgement, Mr Justice Blake, ruled the decision to strike the paediatrician off was justified.