The encryption used by Apple’s iMessage service prevents interception by law enforcement even with the means granted by a federal court order, according to an internal U.S. Drug Enforcement Administration (DEA) memo obtained by CNET. Due to Apple’s encryption method, it is “impossible to intercept iMessages between two Apple devices,” the memo states. Apple boasted about the service’s “secure end-to-end encryption” when it launched in June 2011, and users have flocked to the free service, which requires an Apple iDevice