Chapter 11: Assessing Competency to Stand Trial

Approximately 60,000 competency evaluations occur annually in the United States, guided by the legal standard established in Dusky v. United States, which requires defendants to demonstrate sufficient present ability to consult with counsel with rational understanding and factual comprehension of proceedings. The chapter emphasizes that competency is functionally determined rather than diagnosis-based; a defendant experiencing psychosis or amnesia may remain legally competent if those conditions do not impair their ability to work with counsel or participate rationally in trial. Landmark cases including Godinez v. Moran and Indiana v. Edwards have clarified that competency standards differ from standards for waiving counsel, pleading guilty, or proceeding without representation. When competency doubts arise, evaluations proceed in community or jail settings rather than inpatient hospitals, with only approximately 27.5% of referred defendants ultimately found incompetent. The Jackson v. Indiana decision prohibits indefinite commitment of incompetent defendants, while Sell v. United States restricts involuntary medication administration. Modern assessment relies on functional evaluation approaches that connect specific clinical impairments to required psycholegal abilities within individual cases, supported by forensic assessment instruments including the Fitness Interview Test-Revised, MacArthur Competence Assessment Tool–Criminal Adjudication, Evaluation of Competency to Stand Trial–Revised, and Inventory of Legal Knowledge. Special considerations apply to defendants with intellectual disabilities, who often demonstrate a cloak of competence masking genuine deficits and require specialized assessment tools like the Competence Assessment for Standing Trial for Defendants with Mental Retardation. Juvenile defendants represent another specialized population with developmentally sensitive competency factors, addressed through instruments like the Juvenile Adjudicative Competence Interview. Evaluators must follow rigorous preparation protocols, provide detailed clinical reasoning in reports explaining precisely how disabilities affect legal understanding, maintain separation between competency and insanity evaluations, and recognize that information obtained during competency assessment cannot be used in guilt determination or sentencing.