Tim Cook

AP Explains: Why smartphones are giving the police fits

The phone used by the gunman who fatally shot 26 people inside a small Texas church has become the latest flashpoint in the privacy wars.

Federal investigators complain that they can't get into Devin Patrick Kelley's phone thanks to security features that shield messages, photos and other stored data from prying eyes. Such measures present a growing frustration for the FBI, which says it's been unable to retrieve data from roughly half the mobile devices it's recently tried to access.

Technology companies insist that strong security based on data-scrambling encryption is essential to protecting digital privacy. Law enforcement officials grumble that warrants should allow...

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