Interactive Massachusetts Deliberation Tree
Not Guilty by Lack of Criminal Responsibility
Under Commonwealth v. McHoul, because evidence of mental illness was raised and the Commonwealth failed to prove beyond a reasonable doubt that the defendant had substantial volitional capacity to conform her conduct to the requirements of law, the jury must return a verdict of lack of criminal responsibility.
Jury Deliberation Controls
Comparative Legal Burden & Insanity Defense Standards
How Massachusetts criminal responsibility compares to the Federal standard enacted after the John Hinckley Jr. trial and other historical jurisdictions.
| Jurisdiction / Rule | Prongs Evaluated | Who Bears Burden? | Standard / Quantum of Proof | Key Distinction |
|---|---|---|---|---|
| Massachusetts Commonwealth v. McHoul (1967) |
Dual Prong: 1. Cognitive (Appreciate wrongfulness) 2. Volitional (Conform conduct) |
Commonwealth (Prosecution) | Beyond a Reasonable Doubt | Prosecution must prove substantial capacity on both prongs once defense introduces evidence. |
| Federal Courts 18 U.S.C. § 17 (Insanity Defense Reform Act 1984) |
Cognitive Only: Severe defect unable to appreciate nature & quality or wrongfulness |
Defendant (Affirmative) | Clear and Convincing Evidence | Eliminated volitional prong entirely; shifted burden to defense following Hinckley verdict. |
| M'Naghten Rule Traditional English common law |
Strict Cognitive Only: Did not know nature/quality or that act was wrong |
Varies by State (Defendant) | Preponderance of Evidence | No allowance for loss of behavioral control / volitional incapacity. |
| Model Penal Code § 4.01 ALI Standard |
Dual Prong: Cognitive and Volitional ("lacks substantial capacity") |
State Dependent | Preponderance (State rules vary) | Basis for Massachusetts McHoul, though MA retained strict prosecution burden. |
Post-Verdict Forensic Trajectory: M.G.L. c. 123 § 16
Debunking the pervasive myth that a lack of criminal responsibility verdict results in immediate public release. Massachusetts law mandates strict psychiatric institutional commitment:
Under M.G.L. c. 123 § 16(a), the judge immediately orders defendant committed to a state forensic psychiatric facility (such as Worcester Recovery Center or Bridgewater State Hospital) for 40 days of intensive observation and risk assessment.
Prior to the 40-day expiration, the District Attorney or facility medical director petitions the court for civil commitment. If court finds failure to hospitalize creates substantial likelihood of serious harm, commitment is ordered for up to 6 months.
Under § 16(c), subsequent commitments are reviewed annually by a judge. The individual cannot be discharged, furloughed, or granted unescorted privileges without formal court approval and notification to the Commonwealth.
Release occurs only when the superintendent and court determine under rigorous evidentiary scrutiny that the individual no longer suffers from a mental illness presenting substantial danger to self or public safety.