Competency to Stand Trial vs. Mental Health Diversion in California
- Jul 13
- 2 min read
Updated: Aug 14
Competency and mental-health diversion are often discussed together, but they answer different legal questions. Confusing them can lead families to expect the wrong hearing or result.
Competency concerns the defendant’s ability to participate now
Under California Penal Code section 1367, a defendant is mentally incompetent if a mental-health disorder or developmental disability leaves the person unable to understand the nature of the proceedings or assist counsel in a rational manner.
The focus is current functioning. Can the person understand the roles of the judge, prosecutor, and defense lawyer? Can the person follow the case, communicate relevant information, and make decisions with counsel? A diagnosis does not automatically mean incompetency, and unusual behavior alone does not decide the issue.
Diversion asks whether treatment should replace ordinary prosecution
Mental-health diversion under Penal Code section 1001.36 is a treatment-based path for eligible defendants. The court evaluates statutory eligibility, the relationship between the disorder and the alleged offense, treatment responsiveness, suitability, and public safety. If diversion is granted, prosecution is postponed while the defendant participates in treatment.
A person may be competent and still seek diversion. Conversely, a person who cannot rationally assist counsel may need competency proceedings before ordinary litigation can continue.
Neither issue is the same as an insanity defense
Competency concerns the person’s present ability to proceed. Diversion concerns treatment and case resolution. An insanity defense concerns the defendant’s mental state at the time of the alleged offense and follows a different legal standard.
Records and treatment plans serve different purposes
A competency evaluation addresses functional abilities related to court. A diversion presentation typically needs a diagnosis, explanation of the disorder’s relevance, provider support, and a realistic treatment plan. Medical privacy should be considered before records are broadly filed or disclosed.
Related reading: Mental Health in a California Criminal Case and How Treatment Plans Help Resolve Criminal Cases.
Attorney review: Martin Winfield, founder of Moments Law Firm, is a California criminal defense attorney whose practice includes mental-health and treatment-related cases.
Last reviewed: August 2026. This article is general information, not legal advice.
