Plymouth, Massachusetts

The trial of Lindsay Clancy, a Massachusetts mother accused of strangling her three children — Cora, Dawson, and Callan — has drawn national attention to the state's distinctive insanity defense standard. Unlike most jurisdictions, Massachusetts places the burden of proof on prosecutors, who must show beyond a reasonable doubt that a defendant both understood right from wrong and could control her actions. Clancy's defense has centered on claims of postpartum psychosis and inadequate mental health treatment leading up to the killings.

The case has become a flashpoint in broader debates over abortion policy, mental health law, and criminal accountability in Massachusetts, following Governor Maura Healey's signing of legislation expanding abortion access. Commentators have drawn comparisons to a similar case in Illinois, where a woman allegedly killed her two-year-old child using the same method, but under a less demanding legal standard for proving insanity. The outcome of the Clancy trial is expected to test how the commonwealth's unusual evidentiary threshold functions in a high-profile child homicide case, with implications for future legal proceedings involving mental illness defenses.