Will federal law enforcement agencies ever be forced to disclose their abuses of American citizens? The Supreme Court could answer that question in its decision on a potentially landmark case it heard last week regarding surveillance of Muslim communities in California. Though the case may be decided on narrow grounds, it involves a legal Pandora's Box that has spawned and shielded the worst abuses of the post-9/11 era.

Beginning in 2006, the FBI sent Craig Monteilh, a former Drug Enforcement Administration informant, into mosques in southern California to gather evidence against Muslims at worship. His FBI handlers gave Monteilh permission to sleep with Muslim women he targeted and to secretly tape record their pillow talk. He also placed a recording device to covertly tape Muslim therapy sessions. National Public Radio noted the surveillance "yielded no results and proved a huge embarrassment to the bureau" after Monteilh went public in 2012 to denounce his own behavior and the FBI.