Crime Stoppers can offer anonymity to its callers because of a legal rule of evidence, which states law enforcement does not have to reveal information that might identify a person who supplies them with information concerning criminal activity. In February of 1997, the Supreme Court of Canada unanimously decided that callers to Crime Stoppers programs were entitled to the protection of this privilege. In a typical case that started from a Crime Stoppers tip, the identity of the informer is unknown to both the Crime Stoppers Coordinator who took the call or internet tip, and the case investigator. The Supreme Court went on to confirm that the privilege is so broad in scope that it prevents disclosure not only of the name of the informer (even if it were to be known) but also of any information that might implicitly reveal his or her identity. This is the premise behind the claim that “Crime Stoppers promises the tipster’s anonymity.”