Expert Report Challenges Validity of Insulin Evidence in Lucy Letby Case

Seven leading pediatricians and toxicologists have presented expert opinions questioning the reliability of insulin tests that played a crucial role in convicting Lucy Letby of murdering seven infants, raising serious doubts about the integrity of the prosecution's case.

In a significant development, a group of seven pediatric experts and toxicologists has raised alarms over the reliability of insulin tests that were instrumental in the conviction of Lucy Letby, a nurse sentenced to life for the murders of seven newborns. These findings were formally presented to the Britain’s Criminal Cases Review Commission on Thursday by Letby’s legal team as part of their ongoing efforts to seek a full appeal.

The trial, which resulted in Letby's conviction in 2023, accused her of intentional harm and murder, asserting that she had injected air into the infants, overfed them, or administered insulin poison. The new expert report critically scrutinizes the original insulin tests cited by the prosecution, claiming that jurors were misled regarding their reliability.

The group, which includes professionals in forensic toxicology, science, and endocrinology, contends that the evidence surrounding insulin and C-peptide testing is fundamentally flawed. They summarized their findings, stating, “Our inescapable conclusion is that this evidence significantly undermines the validity of the assertions made about the insulin and C-peptide testing presented in Court.”

Despite Letby’s steadfast claims of innocence and growing skepticism regarding her conviction—as highlighted in various media discussions—previous attempts by her legal team to reopen the case have been denied. This latest report may fuel ongoing debates about justice and the safeguards against wrongful convictions in serious cases involving alleged medical malpractice.