The Sheriffs Investigative Surveillance Units provides surveillance assistance to Alberta law enforcement agencies conducting on-going, provincially-focused investigations. For example, SISU has been instrumental in covert DNA collection for police agencies. That service has helped lead to the early arrest and imprisonment of numerous criminals.

The support of SISU allows local police agencies more time and resources to address crime in their communities.

In 2008, SISU assisted with 90 investigations across the province. Of those, 23 were homicide cases and 25 were drug-related investigations.