Skip to content

July 2026: Government declines to widen the Thirlwall terms of reference (16 July) · new 100-page insulin report to the CCRC challenging the trial evidence (9 July) · Thirlwall report still expected no earlier than September · inquests relisted to 2027 · Shoo Lee Panel: no medical evidence of deliberate harm.

Lucy Letby Facts

Conflict-map · Post-conviction statistical experts

Prof. Leila Schneps

Mathematician; 'Math on Trial' author

Mathematics in lawStatistical analysis2Expert/professional

Main contribution

Schneps is an American mathematician and, with her daughter Coralie Colmez, co-author of 'Math on Trial: How Numbers Get Used and Abused in the Courtroom' (2013), which examines ten historical cases where mathematical fallacies contributed to wrongful convictions, including Sally Clark's, where a paediatrician wrongly treated two cot deaths as independent events to produce a one-in-73-million figure. The book predates Letby's trial by a decade and does not discuss her case.

Key claim

The book's central argument is that courts and juries can misjudge coincidence, mistaking rare-but-expected events for evidence of deliberate wrongdoing. The Royal Statistical Society's 2022 working-party report on statistical issues in investigating suspected medical misconduct cites the book's Sally Clark chapter as background reading on this type of reasoning error; the report does not apply Schneps's analysis to Letby's case specifically.

Sources

Conflict-map topics this expert participates in

Full biographical profile

Prof. Leila Schneps — biography

Other experts on the same side

Post-conviction statistical experts.