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An internal Drug Enforcement Administration document seen by CNET discusses a February 2013 criminal investigation and warns that because of the use of encryption, "it is impossible to intercept iMessages between two Apple devices" even with a court order approved by a federal judge.

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Police can obtain a special warrant allowing them to sneak into someone's house or office, install keystroke-logging software, and record passphrases. The DEA adopted this technique in a case where suspects used PGP and the encrypted Web e-mail service Hushmail.com. They can also send a suspect malware, purchase a so-called zero day vulnerability to gain control of a target device and extract the contents, or obtain a warrant to seize the physical device and perform a traditional forensics analysis.

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