NFL CFL team up in officiating program

Beginning this season, a group of NFL officials will work as part of CFL crews during preseason and regular-season games in June and July. Those officials, primarily side judges and field judges, then will start their NFL season at the league's annual officiating clinic in late July.

from CBC | NFL News http://www.cbc.ca/sports/football/nfl/nfl-cfl-officials-1.3548140?cmp=rss
via CBC