Statements made during a court-ordered competency evaluation generally cannot be used to prove guilt at a later trial, and the prosecution cannot use them to impeach the defendant who testifies. That protection concerns the examination statements and evidence derived from them; it does not make every mental-health record confidential or bar evidence obtained independently.

Identify the examination and proposed use

Start with the court order appointing the competency examiner, the report, the questions asked, and the evidence the prosecutor now proposes to use. Penal Code section 1369 describes the competency examination and report process. Subdivision (d) addresses examiner qualifications; it is not itself the source of a blanket privilege or immunity. (Penal Code § 1369)

In People v. Arcega, the California Supreme Court held that statements to a court-appointed competency examiner and their fruits could not be used to prove guilt at trial. People v. Pokovich applied the protection to impeachment when the defendant testified at the guilt trial. The court explained the rule in the context of competency evaluations; it did not declare that every statement to every mental-health professional is protected or that all reports are generally confidential. (People v. Arcega; People v. Pokovich)

Trace the source of the evidence

If the prosecution offers a later statement, expert opinion or investigative lead, compare it with the exam report and determine whether it came from the competency examination or from an independent source. Bring the appointment order, report, proposed testimony and any record showing how the later evidence was obtained to counsel. A focused request for a ruling can identify the exact statement or alleged fruit without treating every mental-health item as automatically excluded.

This is a different question from whether a preliminary hearing may proceed while the criminal case is paused for a competency determination, or whether a prosecution expert may examine a defendant when the defense plans to present mental-state evidence. Those examinations have different triggers and rules. The court-ordered competency evaluation also does not make cooperation or refusal consequence-free in every circumstance; ask counsel about the actual order and procedural posture.

For a broader overview of competency hearings, see the firm’s practice page. For help reviewing a proposed use of competency-exam material, contact the Law Offices of David S. Chesley at (800) 755-5174.