Static-99R and CPORT: What Sex Offense Risk Scores Actually Mean
Somewhere in nearly every sex-offense case file there is a number — a Static-99R score, and increasingly in child sexual abuse material (CSAM) cases, a CPORT score. Attorneys argue over these numbers, judges rely on them, and probation reports repeat them. But in our experience, the scores are frequently used in ways the instruments themselves do not support. This is a plain-language guide to what the two most common instruments actually measure, and — just as important — what they cannot tell you.
What an Actuarial Instrument Is
An actuarial risk tool is not a clinical opinion dressed up in numbers. It is closer to the tables an insurance company uses: researchers followed large groups of convicted men after release, identified a small set of facts that statistically separated those who reoffended from those who did not, and turned those facts into a scored checklist. The output places an individual in a group of people with similar histories and tells you how that group performed. That group-based logic is the source of both the instruments’ strength (they outperform unstructured professional judgment, which decades of research have shown to be barely better than chance) and their limits (a group statistic is not a prophecy about one man).
Static-99R — the Default Instrument
The Static-99R is the most widely used sexual-recidivism instrument in the world, and it is California’s SARATSO-designated static risk tool — the score courts and probation departments here will expect to see. It contains ten items, all “static” (historical and unchangeable): the person’s age, whether he has lived with an intimate partner, prior sexual and nonsexual offense history, whether victims were strangers, unrelated, or male, and so on. Scores map to five standardized risk levels, from Level I (very low) through Level IVb (well above average).
What attorneys should understand about it:
- It is relative, not absolute. A score tells you how a person’s risk-relevant history compares with other convicted men. It is not a statement that “he has an X percent chance of reoffending” — and reports that convert scores into confident individual probabilities are overreaching.
- It cannot improve, only age. Because every item is historical, no amount of treatment, insight, or supervision compliance changes a Static-99R score. A man can transform his life and carry the same number. That is not a flaw — it is the design — but it means the score must be supplemented by dynamic (changeable) measures if the court wants a current picture.
- It misses what it was never built to see. Sexual-interest findings, treatment response, psychopathy, and protective factors all sit outside the instrument. A low Static-99R with alarming objective testing, or a high one with strong protective factors, are exactly the cases where an evaluator earns their fee.
CPORT — for Child Sexual Abuse Material Cases
The Static-99R was developed and normed largely on contact offenders, and its application to men whose only offense is possession or viewing of CSAM has real limitations. For those cases the field has moved to the CPORT — the Child Pornography Offender Risk Tool, developed by Michael Seto and Angela Eke from follow-up studies of men with child pornography offenses. It is a seven-item tool scored 0 to 7, using facts such as age, prior criminal history, contact-offense history, and indicators of pedophilic or hebephilic sexual interest.
Two things make CPORT worth knowing about. First, base rates: recidivism among CSAM-only offenders is, as a group, substantially lower than most courts assume, and CPORT research has helped quantify that. Second, specificity: scoring a CSAM defendant with an instrument built for his actual offense type is simply more defensible — in both directions — than borrowing one built for contact offenders. In our reports for CSAM cases we score CPORT alongside the standard battery, and new validation studies and norms continue to refine the tool.
Where the Numbers Belong in a Real Evaluation
An actuarial score is one leg of a stool. In a full psychosexual evaluation it sits alongside objective measures of sexual interest, validity-checked self-report instruments, personality testing, the record, and a several-hour clinical interview. When all of those point the same way, the actuarial number gains meaning; when they diverge, the divergence is the finding. This is also what California law implicitly asks for: the report the court must obtain before granting probation in these cases has to address the defendant’s potential for positive response to treatment — a question no static instrument can answer. (We cover those statutory requirements in our guide to court-ordered evaluations under PC 288.1 and PC 1203.067.)
Questions Worth Asking About Any Risk Score in Your Case
- Was the right instrument used for this offense type — and was CPORT used if this is a CSAM-only case?
- Is the score reported as a standardized risk level, or converted into an individual “percent chance” the research does not support?
- What dynamic and protective factors does the report weigh alongside the static score?
- Do the objective testing and the actuarial score agree — and if not, does the report explain the disagreement or hide it?
Our practice provides forensic and psychosexual evaluations for state and federal courts throughout California, including CSAM cases scored with CPORT and the full SARATSO instrument set. Attorneys with a case or a scoring question can contact us through the secure form or call (619) 234-7970. Dr. Reavis personally responds to all inquiries within 24 hours.