The admissibility of unlawfully obtained evidence in criminal proceedings has generated controversy throughout the Europe and America. In the United States, there has been renewed debate in recent years over the propriety of the judicially-created exclusionary rule as a remedy for violations of the Fourth Amendment guarantee against unreasonable searches and seizures. When defining the scope and purpose of the rule, the US Supreme Court has placed ever increasing emphasis on the likely deterrent effect which suppressing evidence will exert on law enforcement (Casey, 2002).