Federal Justice Minister David Lametti is expected to introduce legislation as soon as Thursday to legalize single-event sports betting in Canada — ending a decades-old prohibition on gambling that experts say has funnelled billions of dollars into the black market. The proposed government legislation, if passed, would allow gamblers to place a bet on the outcome of a single sports game, like a football match or a hockey game. Currently, sports bettors in Canada are limited to "parlay" bets — meaning they have to place bets on more than one game, and pick the winning team in each contest, to see any sort of windfall.