The Netflix documentary The Investigation of Lucy Letby, released on Wednesday, was produced with the cooperation of the Cheshire police. However, as the article reports, recent shifts in the case have cast the film’s narrative in a new light. Since production began, many medical experts have criticized the prosecution's evidence and the way police handled the investigation.

Leading these critics is Dr. Shoo Lee, a Canadian neonatologist (a specialist in newborn care). He argues that the police misused his research. His panel of experts contends that the infants died from natural medical causes and poor hospital standards rather than foul play.

The film reveals that Dr. Dewi Evans, a retired pediatrician, volunteered to help the investigation after reading a report in The Guardian. He provided new diagnoses that contradicted several previous findings. Before his involvement, a coroner’s autopsy, a formal inquest, internal hospital reviews, and outside consultants had all failed to find any evidence of deliberate harm. According to the documentary, the police did not look for a second opinion once they had Dr. Evans’s input.

Viewers are shown disputed footage of Letby’s three arrests and her personal diaries. While these notes contain phrases that look like confessions, they also include firm denials. Her lawyer, Mark McDonald, explains that she wrote these notes while in deep mental distress during counseling sessions after she was removed from her post. The documentary also features interview footage where Letby consistently denies the crimes.

In a significant moment, a consultant from the Chester hospital, Dr. John Gibbs, admits to having a "tiny, tiny, tiny" doubt that the police might have the wrong person. The article notes that this is the first time one of the doctors who originally accused her has publicly expressed any uncertainty.