The use of psychological testing in criminal court is a high-stakes task. Forensic psychologists are often asked to evaluate questions that can shape a defendant’s liberty, treatment pathway, trial participation, or legal strategy. In Competence to Stand Trial evaluations, Mental State at the Time of the Offense evaluations, and other criminal forensic contexts, assessment tools must do more than describe symptoms. They must help the evaluator answer legally relevant questions.
The Millon Clinical Multiaxial Inventory-IV, or MCMI-IV, can offer useful information about personality patterns and clinical syndromes. However, like any psychological test used in criminal court, its value depends on how carefully the forensic psychologist uses it. The MCMI-IV should not be treated as a shortcut to a legal opinion. It is most useful when it helps generate hypotheses, clarify personality functioning, identify response style concerns, and support a broader forensic case formulation.