Recently unsealed records reveal a much more extensive secret relationship than previously known between the FBI and Best Buy's Geek Squad, including evidence the agency trained company technicians on law-enforcement operational tactics, shared lists of targeted citizens and, to covertly increase surveillance of the public, encouraged searches of computers even when unrelated to a customer's request for repairs.

To sidestep the U.S. Constitution's prohibition against warrantless invasions of private property, federal prosecutors and FBI officials have argued that Geek Squad employees accidentally find and report, for example, potential child pornography on customers' computers without any prodding by the government. Assistant United States Attorney M. Anthony Brown last year labeled allegations of a hidden partnership as "wild speculation." But more than a dozen summaries of FBI memoranda filed inside Orange County's Ronald Reagan Federal Courthouse this month in USA v. Mark Rettenmaier contradict the official line.