CSIS and RCMP is short for Canadian Security Intelligence Service and Royal Canadian Mounted Police respectively. CSIS is a civilian agency dedicated to domestic and foreign intelligence. The RCMP is a Civilian Federal Law Enforcement Agency. At one time, the RCMP had the role currently held by CSIS.
Dex says "But, um" once. This is a legendary phrase Cobie Smulders's character used on How I Met Your Mother (2005).