The Offender Accountability Act (OAA) was enacted by the Washington State Legislature in 1999. The OAA requires the Department of Corrections (DOC) to supervise felony offenders according to their risk for future offending.
In a 2003 report, the Washington State Institute for Public Policy (Institute) analyzed the validity of DOC’s risk for reoffense instrument, the Level of Service Inventory—Revised (LSI-R). As part of the analysis, the Institute suggested that the predictive accuracy of the LSI-R could be strengthened by including more static risk information about an offender’s prior record of convictions. DOC subsequently asked the Institute to develop a new static risk instrument based on offender demographics and criminal history.
This report describes our evaluation of the validity of the static risk instrument developed for DOC. In October 2008, we updated Appendix C of the report to include the intercepts or constants for the three static risk score calculations. These intercepts are added to the summed weighted item scores to produce the risk scores. These constants are +20, +15, and +10 respectively for the Felony, Property & Violent, and Violent Risk Scores.