This study entails in-depth interviews with 150 probationers with and 150 probationers without mental illness, to determine the extent to which psychiatric symptoms, criminogenic risk factors, and other personal factors influence the occurrence of technical violations of probation. Additionally, the study seeks to identify the individual-level personal factors that are most strongly related to probation officers’ decisions to file a formal violation with the court. This study is funded, in part, by an Early Career Psychologist grant-in-aid from the American Psychology-Law Society.