Progressively responsible experience, gained after completion of a bachelor's degree from an accredited college or university, in such fields as probation, pretrial services, parole, corrections, criminal investigations, or work in substance/addiction treatment, public administration, human relations, social work, psychology, or mental health. To qualify for the position of U.S. Probation Officer at CL-27 or CL-28, the applicant must be a college graduate with a bachelors degree from an accredited college or university in a field of academic study which provides evidence of the capacity to understand and apply the legal requirements and human relations skills involved in the position and is required for all probation officer positions.