California Criminal Jury Instructions (CALCRIM) (2017)
3451. Present Mental Competence of DefendantDownload PDF
3451.Present Mental Competence of Defendant
You must decide whether the defendant is mentally competent to stand
trial. That is the only purpose of this proceeding. Do not consider
whether the defendant is guilty or not guilty of any crime or whether
(he/she) was sane or insane at the time that any alleged crime was
The defendant is mentally competent to stand trial if (he/she) can do all
of the following:
1. Understand the nature and purpose of the criminal proceedings
2. Assist, in a rational manner, (his/her) attorney in presenting (his/
3. Understand (his/her) own status and condition in the criminal
The law presumes that a defendant is mentally competent. In order to
overcome this presumption, ((the defendant/the People) must prove/it
must be proved) that it is more likely than not that the defendant is
now mentally incompetent because of a (mental disorder/developmental
[A developmental disability is a disability that begins before a person is
18 years old and continues, or is expected to continue, for an indeﬁnite
period of time. It must be a substantial handicap and does not include
other handicapping conditions that are solely physical in nature.
Examples of developmental disabilities include mental retardation,
cerebral palsy, epilepsy, autism, and conditions closely related to mental
retardation or requiring treatment similar to that required for mentally
New January 2006
The court has a sua sponte duty to instruct the jury on the standard for
The party that seeks a ﬁnding of incompetence bears the burden of proof. If the
court raises the issue, neither party bears that burden. Choose the appropriate
language regarding which party bears the burden of proof in the paragraph that
begins with “The law presumes that . . . .” (People v. Skeirik (1991) 229
Cal.App.3d 444, 459–460 [280 Cal.Rptr. 175].)
Give CALCRIM No. 3550, Pre-Deliberation Instructions, and any other relevant
post-trial instructions, such as CALCRIM No. 222, Evidence, or CALCRIM No.
Do not give CALCRIM No. 224, Circumstantial Evidence: Suffıciency of Evidence,
or CALCRIM No. 225, Circumstantial Evidence: Intent or Mental State. These
instructions have “no application when the standard of proof is preponderance of
the evidence.” (People v. Johnwell (2004) 121 Cal.App.4th 1267, 1274 [18
• Instructional Requirements. Pen. Code, §§ 1367–1370.
•Developmental Disability Deﬁned. Pen. Code, § 1370.1(a)(1)(H).
• Presumption of Competence. Pen. Code, § 1369(f).
• Unanimous Verdict. Pen. Code, § 1369(f).
5 Witkin & Epstein, California Criminal Law (3d ed. 2000) Criminal Trial, § 698.
3Millman, Sevilla & Tarlow, California Criminal Defense Practice, Ch. 64,
Suspension of Criminal Proceedings, §§ 64.01, 64.02 (Matthew Bender).
6 Millman, Sevilla & Tarlow, California Criminal Defense Practice, Ch. 124,
Jurisdiction and Disposition Hearings, § 124.04 (Matthew Bender).
Threshold for Section 1368 Hearing
Atrial court must conduct a section 1368 hearing when there is substantial
evidence of incompetence. (People v. Cox (1978) 82 Cal.App.3d 221, 225–226
[147 Cal.Rptr. 73].) Substantial evidence raises a reasonable doubt about the
defendant’s competence to stand trial. (People v. Frye (1998) 18 Cal.4th 894,
951–952 [77 Cal.Rptr.2d 25, 959 P.2d 183].)
Defense Counsel May Seek Finding Contrary to Client’s Wishes
A section 1368 hearing is civil in nature. Since neither guilt nor innocence is at
issue, defense counsel must “advocate the position counsel perceives to be in the
client’s best interests even when that interest conﬂicts with the client’s stated
position [citation].” (People v. Stanley (1995) 10 Cal.4th 764, 804 [42 Cal.Rptr.2d
543, 897 P.2d 481].)
CALCRIM No. 3451 DEFENSES AND INSANITY