Government of Canada announced Feb 29 that there is a new airport security initiative "Under this OSS arrangement, passengers and their belongings that have been screened at their point of departure may not have to go through additional screening at participating Canadian airports where they have connecting flights. Making airport connections simpler and faster allows travellers to reach their family and friends more quickly and allows business travellers to get their business done more swiftly. It also helps the Canadian aviation industry attract more flights to or through Canada."

Boarding pass that I printed tonight had OSS on it where TSA Pre usually is printed. Connecting from PSP to YVR to YYC

Announcement http://news.gc.ca/web/article-en.do?nid=1036799