He became a trained investigator in child abuse, cyber crime, fraud, forensics and major crimes. As a detective with the EPS, he was involved with numerous investigations. He was also part of the Combined Traffic Services of Saskatchewan’s Southeast Unit. And in 2017, he became the EPS’s school resource officer, a natural role since he studied education at Brandon University before ultimately opting for a career in law enforcement. He also served as the president of the Estevan Police Association, and was on the Saskatchewan Association of Police Officers board. Pierson had been on leave since 2017 due to post-traumatic stress disorder.