Opinion
Under California’s Sexually Violent Predators Act (SVPA), convicted sex offenders who have served their prison terms may be *982 involuntarily committed to a state mental hospital if found to be “sexually violent predator[s].” (Welf. & Inst. Code, § 6604; further undesignated statutory references are to this code.) That finding is made after a trial (§ 6603), based on proof beyond a reasonable doubt that the person to be involuntarily committed meets the statutory definition of a sexually violent predator (§ 6604).
The SVPA defines a sexually violent predator as someone who “has been convicted of a sexually violent offense against two or more victims and who has a diagnosed mental disorder that makes the person a danger to the health and safety of others in that it is likely that he or she will engage in sexually violent criminal behavior” if released. (§ 6600, subd. (a)(1), italics added.) At issue here is the meaning of the statutory term “likely” in section 6600, subdivision (a)’s definition of a sexually violent predator. That definition applies at trial, where the trier of fact decides whether the convicted sex offender, after serving the requisite prison term, is to be involuntarily committed.
Recently, in
People
v.
Superior Court (Ghilotti)
(2002)
I
In 1981, defendant was convicted of forcible rape (Pen. Code, § 261, subd. (a)(2)) and sentenced to state prison for eight years. In 1985, while on parole for the 1981 offense, defendant again committed forcible rape, for which he was in 1986 convicted and sentenced to a prison term of 18 years. Before defendant’s eligibility for release on parole for the 1986 rape conviction, the San Diego County District Attorney petitioned the superior court to have defendant committed to the State Department of Mental Health as a sexually violent predator. (§ 6601, subd. (a).)
At the jury trial on that petition, the prosecution presented evidence on the 1981 and 1986 rape convictions: Both involved defendant’s violent assaults *983 on women who were strangers to him. In the 1981 incident, defendant lured the victim to his home and sexually assaulted her. Four months after his release on parole in 1985, defendant attacked his second victim, whom he beat, bit, and sexually assaulted.
Prosecution witness Mary Miccio-Fonseca, a clinical psychologist, diagnosed defendant as suffering from a “paraphilia” or a “paraphiliac disorder,” which she described as an incurable sexual disorder distinguished by sexual arousal from perverse or unorthodox encounters. Initially, Dr. Miccio-Fonseca described the sexual disorder as paraphilia NOS (Not Otherwise Specified) but she later changed her diagnosis to sexual sadism. 1 Defendant’s score of 4 on the Rapid Risk Assessment for Sexual Offense Recidivism (RRASOR), a clinical tool for evaluating the probability of a sexual offender’s reoffending, indicated a 32.7 percent likelihood that defendant would commit another violent sexual offense within five years and a 48.6 percent likelihood of doing so within 10 years.
Another expert witness for the prosecution, clinical psychologist Charles Jackson, assessed defendant as having two mental disorders: paraphilia NOS manifested by sex with nonconsenting individuals, and antisocial personality disorder. In Dr. Jackson’s opinion, defendant continued to pose a danger to others, which was atypical of sex offenders generally, because the risk of reoffending tends to decrease as the person grows older.
The defense presented the expert testimony of two clinical psychologists, Drs. Theodore Donaldson and Ricardo Weinstein. Both disagreed with the expert testimony presented by the prosecution that defendant suffered from a paraphilia. Specifically, the defense psychologists did not consider defendant to be a sexual sadist, because his primary gratification in forcible sex was sexual rather than the infliction of pain on his victims. Thus, in their view, defendant’s sex offenses were not a product of a mental illness (a requisite for involuntary commitment under the SVPA). According to Dr. Donaldson, the likelihood of defendant’s committing another sexually violent offense *984 was “better than 50 percent probability,” but his doing so would be entirely volitional.
Defendant sought a jury instruction that would have substituted the phrase “more likely than not” for the word “likely” in the statutory definition of a sexually violent predator (§ 6600, subd. (a)). The trial court denied the request. It instructed the jury in accordance with the statute, and defined a sexual predator as a person who “has been convicted of a sexually violent offense against two or more victims for which he or she received a determinate sentence and who has a diagnosed mental disorder that makes the person a danger to the health and safety of others in that it is likely that he or she will engage in sexually violent criminal behavior’'’ if released. (§ 6600, former subd. (a), italics added.) The jury found defendant to be a sexually violent predator, and the trial court ordered him committed to a state mental hospital. The Court of Appeal affirmed.
We granted review to decide the meaning of the term “likely” as it appears in section 6600, subdivision (a), which defines a sexually violent predator.
II
We begin with a brief overview of the SVPA, which the Legislature enacted on October 11, 1995, and which became effective on January 1, 1996. (Stats. 1995, chs. 762 & 763, pp. 5912-5929.) The SVPA provides for “the involuntary civil commitment of certain offenders, following the completion of their prison terms, who are found to be [sexually violent predators] because they have previously been convicted of sexually violent crimes and currently suffer diagnosed mental disorders which make them dangerous in that they are likely to engage in sexually violent criminal behavior.”
(Ghilotti, supra,
The process of determining whether a convicted sex offender can be involuntarily committed under the SVPA as a sexually violent predator “ ‘takes place in several stages, both administrative and judicial.’ ”
(Ghilotti, supra,
Full evaluation, as described in section 6601, subdivision (d) is by “ ‘two practicing psychiatrists or psychologists, or one practicing psychiatrist and one practicing psychologist, designated by the Director [of the State Department of Mental Health]. If both evaluators concur that the person has a diagnosed mental disorder so that he or she is likely to engage in acts of sexual violence without appropriate treatment and custody, the Director shall forward a request for a [commitment] petition ... to the county . . . where the offender was convicted of the crime for which he is currently imprisoned.’”
(Ghilotti, supra,
First, there is a hearing before the superior court to decide “ ‘whether there is “probable cause” to believe the person named in the petition is likely to engage in sexually violent predatory criminal behavior upon release.’”
(Ghilotti, supra,
Ill
We now turn to the issue on which we granted review in this case: The meaning of “likely [to] engage in sexually violent criminal behavior” as used in the SVPA’s section 6600, subdivision (a), describing the findings the trier of fact must make at trial to determine whether the convicted sex offender, after serving the requisite prison term, should be committed to a state mental hospital as a sexually violent predator.
While this case was pending before us, we granted review in
Ghilotti, supra,
Section 6601, subdivision (d), at issue in Ghilotti, pertains to the evaluation of the convicted sex offender’s mental condition by two practicing psychiatrists or psychologists, the first phase of the SVPA’s involuntary commitment proceedings. (Ghilotti, supra, 27 Cal.4th at pp. 915-924.) The phrase we construed there was “likely to engage in acts of sexual violence without appropriate treatment and custody.” (§ 6601, subd. (d), italics added.)
We noted that several dictionaries and modem legal references had given the word “likely” a variety of meanings flexibly covering “a range of expectability from possible to probable.”
(Ghilotti, supra,
Thus, we concluded in Ghilotti: “[T]he phrase
‘likely
to engage in acts of sexual violence’ (italics added), as used in section 6601, subdivision (d), connotes much more than the mere
possibility
that the person will reoffend as a result of a predisposing mental disorder that seriously impairs volitional control. [But] the statute does not require a precise determination that the chance of reoffense is
better than even.
Instead, an evaluator applying this standard must conclude that the person is ‘likely’ to reoffend if, because of a current mental disorder which makes it difficult or impossible to restrain violent sexual behavior, the person presents a
substantial danger,
that is, a
serious and well-founded risk,
that he or she will commit such crimes if free in the community.”
(Ghilotti, supra,
At issue here is the final stage of the SVPA’s commitment process, a trial to determine whether the convicted sex offender, after serving the requisite prison term, is to be involuntarily committed as a sexually violent predator. At that trial, the prosecution must show beyond a reasonable doubt that it is “likely that [the person] will engage in sexually violent criminal behavior” if released. (§ 6600, subd. (a), italics added.)
*987
In the trial court, in the Court of Appeal, and in his opening brief in this court, defendant argued that a sexually violent predator, as defined in subdivision (a) of section 6600, is one whose likelihood of reoffending is “more likely than not.” In
Ghilotti, supra,
Our conclusion here is also consistent with our recent decision in
Cooley v. Superior Court
(2002)
Thus, in a trio of recent cases, we have given the same meaning to the word “likely” in three different provisions of the SVPA. In
Ghilotti, supra,
To summarize, under section 6600, subdivision (a), which is at issue here, a person is “likely [to] engage in sexually violent criminal behavior” if at trial the person is found to present a substantial danger, that is, a serious and well-founded risk, of committing such crimes if released from custody. 2
IV
In his supplemental brief, defendant argues that at his 1999 SVPA trial, the trial court should, on its own initiative, have instructed the jury that the term “likely” as used in the SVPA’s statutory definition of sexually violent predator meant that defendant presented a substantial danger, that is, a serious and well-founded risk, of committing sexually violent predatory crimes if released from custody.
The rules governing a trial court’s obligation to give jury instructions without request by either party are well established. “Even in the absence of a request, a trial court must instruct on general principles of law that are . . . necessary to the jury’s understanding of the case.”
(People
v.
Mayfield
(1997)
As is clear from our recent decision in
Ghilotti, supra,
This case, however, was tried before our recent decision in
Ghilotti, supra,
Disposition
The judgment of the Court of Appeal is affirmed.
George, C. J., Baxter, J., Werdegar, J., Chin, J., Brown, J., and Moreno, J., concurred.
Appellant’s petition for a rehearing was denied April 9, 2003.
Notes
The Diagnostic and Statistical Manual of the American Psychiatric Association (4th ed. 1994) (DSM IV) lists paraphilias as sexual dysfunctions and describes their general characteristics: “[R]ecurrent, intense sexually arousing fantasies, sexual urges, or behaviors generally involving 1) nonhuman objects, 2) the suffering or humiliation of oneself or one’s partner, or 3) children or other nonconsenting persons, that occur over a period of at least 6 months” which “cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.” (DSM IV, pp. 522-523.) “Paraphiliac imagery may be acted out with a nonconsenting partner in a way that may be injurious to the partner (as in Sexual Sadism or Pedophilia)” rendering “[t]he individual . . . subject to arrest and incarceration.” (DSM IV, p. 523.) The DSM IV lists nine categories of paraphilia, including the two diagnosed here: sexual sadism and paraphilia NOS, the residual category. (DSM IV, p. 523.)
Evidence of the person’s amenability to voluntary treatment, if any is presented, is relevant to the ultimate determination whether the person is likely to engage in sexually violent predatory crimes if released from custody. (See
Cooley, supra,
