The "Mr. Big" ruling is a game changer for those convicted in sting operations. A Supreme Court of Canada ruling calling into question the reliability of confessions obtained during so-called Mr. Big sting operations could prompt the review of dozens of convictions, some legal experts say. This type of sting involves police posing as criminals in an attempt to obtain a confession from a suspect. As It Happens speaks with the retired RCMP officer who played "Mr. Big" in the Nelson Hart murder investigation. He says the Supreme Court of Canada decision will hurt future investigations into serious crime.