Final answer:
The Static-99 categorizes a high-risk offender as an individual with a high score on the scale, indicating a greater chance of sexual or violent recidivism among adults convicted of sexual offenses.
Step-by-step explanation:
According to the Static-99 assessment tool, a high-risk offender is an individual who scores highly on this actuarial scale designed for adults convicted of sexual offenses. This tool evaluates both static (unchangeable) risk factors, like previous offenses, and dynamic (changeable) factors, such as age. It is used by criminal justice and mental health professionals to estimate the probability of sexual and violent recidivism, aiding in decisions regarding sentencing, parole, and treatment options.