INTRODUCTION The Canadian Security Intelligence Service (CSIS) is responsible for safeguarding Canada against activities or persons who could pose a threat to national security. These threats include terrorists activities, espionage activities or foreign influenced activities in Canada. The CSIS is a civilian Service that gets its roots from the RCMP. While the Service has the ability to use very intrusive powers, it must balance these powers with the rights and freedoms of persons living in a democratic society. This paper will outline the duties CSIS performs and why Canada needs a domestic security intelligence service. Can