Mesa Police Department
Sergeant Lien has been employed with the Mesa Police Department since 2003. Prior to promoting to sergeant, he worked as a patrol officer, Gang Unit detective and Special Investigations Unit (SIU) detective. While in SIU he worked as a strict undercover detective. While in the Gang Unit and Special Investigations Unit Sergeant Lien participated in several multi-jurisdiction operations and task forces. Sergeant Lien promoted to the rank of sergeant in 2015 and was assigned to lead the Mesa Police Department Human Exploitation and Trafficking (HEaT) Unit in 2017. Sgt. Lien has run several proactive human trafficking operations focusing on victim rescues, buyer suppression and trafficker suppression for adults and children.