Evaluating Moral Injury in Military Pension and Compensation Claims

Clinical Conceptualisation of Moral Injury

Moral injury is a term used to describe the psychological distress resulting from actions, or the lack of action, that transgress deeply held moral beliefs and expectations. In medico-legal practice, it is essential to distinguish this construct from established psychiatric disorders such as Post-Traumatic Stress Disorder (PTSD) or Major Depressive Disorder. Unlike PTSD, which is defined by fear-based reactions to life-threatening trauma, moral injury is characterised by profound shame, guilt, and existential distress. Crucially, ‘moral injury’ is not a recognised diagnostic category within the DSM-5 or ICD-11. Consequently, it should not be conflated with a clinical psychiatric diagnosis. Where a claimant presents with distress attributed to moral injury, the psychiatric expert must determine whether those symptoms coalesce into a formal, medically recognised diagnosis to satisfy the criteria for psychiatric injury in a legal context.

The Role of the Expert Witness in Military Litigation

In claims involving mental health outcomes following military service, the psychiatric expert is tasked with clarifying the nexus between alleged moral injury and any psychiatric sequelae. The expert’s duty is to assist the court or tribunal by providing an independent opinion rooted in clinical assessment and objective methodology. When conducting comprehensive assessments for military personnel, the expert must disentangle combat-related stressors from perceived moral injury, while accounting for other factors such as organic brain injury, chronic pain, or substance misuse. Adherence to the expert’s duty to the court—prioritising independence over party-driven bias—is fundamental to the integrity of the evidence.

Evidentiary Challenges and Causation

Establishing causation remains a complex task in military claims. Under the standard ‘but-for’ analysis, the court requires evidence that the psychiatric injury would not have occurred but for the specific event or stressors identified. A frequent challenge is the tendency to attribute all post-service psychiatric symptoms to a single event that the claimant identifies as morally injurious. To provide a robust opinion, the expert must rigorously examine longitudinal medical records to identify pre-existing vulnerabilities, subsequent life events, and the temporal relationship between the alleged index event and the onset of symptoms.

Psychometric Assessment and Symptom Validity

Objective psychometric testing can provide a quantitative basis for clinical findings in service-related claims. Validated instruments are frequently employed, though their utility is subject to the expert’s clinical judgement regarding their appropriateness for the specific case. In the context of litigation, assessments must account for the possibility of symptom exaggeration. When clinically indicated, the use of symptom validity tests may be appropriate to assess the reliability of the reported symptoms. Such tools are not diagnostic in isolation but assist the expert in determining the accuracy of the prognosis.

Procedural Considerations for Legal Professionals

Instructing solicitors are responsible for ensuring that the letter of instruction is precise and that all relevant medical and service records are provided promptly. Where an expert is appointed under the court’s direction as a single joint expert pursuant to CPR 35.7, the parties must ensure instructions are managed in accordance with CPR 35.8. If separate experts are instructed, they may be directed by the court to participate in discussions under CPR 35.12 to identify areas of agreement and disagreement, resulting in a joint statement. These procedural steps are intended to focus the evidence on core issues of diagnosis, causation, and prognosis. Ultimately, it remains the court’s responsibility to determine liability, and the expert’s role is to provide the diagnostic evidence necessary to inform that determination.

• Identify whether symptoms constitute a DSM-5 or ICD-11 recognised psychiatric disorder.
• Scrutinise longitudinal medical records to establish a temporal link between service events and symptom onset.
• Distinguish between psychiatric injury and non-diagnostic states such as moral distress.
• Ensure adherence to the duties of independence required under the applicable procedural rules.