Police investigators and professionals in related investigative occupations follow leads and investigate circumstances relating to crimes committed and obtain information to prevent crimes. They plan and coordinate investigations, collect evidence, interview suspects, victims, witnesses and other stakeholders, conduct surveillance and testify in court. They are employed by municipal, provincial and federal governments. This unit group includes coroners and medical examiners.

Probation officers monitor the conduct and behaviour of criminal offenders serving probation terms and serving sentences of two years less a day. They are employed by provincial governments. Parole officers monitor the reintegration of criminal offenders serving the remainder of sentences on conditional release and individuals that are subject to a long-term supervision order. They also assess inmates and develop rehabilitation programs for criminal offenders who are incarcerated in correctional facilities. They are employed by federal and provincial governments. Both probation and parole officers work in the community and in correctional facilities including young offender's correctional facilities.