PTSD Criminology

Apply the actus reus requirements of section 20 of the Offences Against the Person Act 1861—including wounding or grievous bodily harm, causation, and unlawfulness—to a neutral fact pattern.

Apply the section 20 mens rea test of intention or subjective recklessness as to some physical harm, explaining why foresight of grievous bodily harm is unnecessary.

Classify a PTSD-related contention as concerning mens rea, self-defence, automatism or insanity, or sentencing, and rule out diminished responsibility and loss of control as homicide-only partial defences.

Formulate the specific legally relevant proposition that PTSD evidence would need to support under each possible route, rather than treating the diagnosis as a defence in itself.

Differentiate hyperarousal, re-experiencing, avoidance, and dissociation, and relate them cautiously to perception, memory, awareness, foresight, or control without assuming causation.

Distinguish evidence of a PTSD diagnosis from evidence about the defendant’s functioning during the incident and from an expert’s retrospective inference about that functioning.

Construct a legally focused chronology connecting trauma history, symptom onset, possible triggers, conduct during the incident, and behaviour afterward.

Evaluate whether contemporaneous records, witness accounts, communications, footage, and post-incident conduct corroborate the claimed symptom–incident connection or support alternative explanations.

Apply the necessity requirement in self-defence by assessing whether force was necessary in the circumstances the defendant honestly believed to exist.

Apply section 76 of the Criminal Justice and Immigration Act 2008 to assess whether the degree of force used was reasonable in the circumstances as the defendant believed them to be.

Apply the legal limits on PTSD evidence in self-defence, distinguishing its possible relevance to an honestly perceived threat from any attempt to make excessive force automatically reasonable.

Construct balanced defence and prosecution analyses of a PTSD-related self-defence claim, including what is needed to raise the issue and what the prosecution must disprove.

Assess whether PTSD-related evidence could raise reasonable doubt that the defendant actually foresaw a risk of some physical harm, distinguishing absent foresight from impaired judgment, anger, or disinhibition.

Distinguish the total loss of voluntary control required for automatism from reduced, impaired, or poorly regulated control, and identify the evidence needed to raise automatism.

Apply the internal–external cause distinction and the M’Naghten criteria to a claimed PTSD-related dissociative episode without assuming that trauma or diagnosis determines its legal classification.

Compare the ordinary acquittal that may follow non-insane automatism with the special verdict and possible disposals associated with insanity, explaining why the classification has practical consequences.

Evaluate the admissibility and weight of a PTSD expert opinion by examining relevant expertise, independence, factual foundation, reasoning, alternative explanations, and acknowledged limitations.

Compare the evidential and legal burdens applicable to self-defence, non-insane automatism, insanity, and a challenge to the prosecution’s proof of mens rea.

Apply the relevant Sentencing Council assault and mental-disorder guidance to assess whether a demonstrated connection between PTSD and the offence may affect culpability, mitigation, treatment, or risk-management considerations.

Draft a concise IRAC memorandum for a neutral or anonymised section 20 scenario that identifies the strongest argument, realistic alternatives, evidential weaknesses, distinctions between trial defences and mitigation, and questions for a qualified defence lawyer.