That "Individuals with mental illnesses are over-represented in probation and parole populaces".
Research recommends that "Individuals with mental illnesses are over-represented in probation and parole populaces at assessed rates extending from two to four times general community"
The Bureau of Justice Statistics is an office of the Department of Justice. It gathers, investigates, distributes, and disperses data on wrongdoing, criminals, victims of criminal activities etc.