Over the summer, the US Department of Justice obtained a court order to forceApple to turn over text messages between subjects in an ongoing investigation made using iPhone and the iMessage system. The court order for the text messages was part of an investigation into suspects allegedly involved in drug and gun related crimes.

When Apple was presented with the court order, the company refused to comply on the grounds that the iMessage system was encrypted and it was unable to hand over the text messages. Law enforcement agencies have warned in the past that issues such as this were going to happen as Apple and Google embraced tougher encryption to protect privacy.
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https://www.slashgear.com/apple-and-us-government-in-a-showdown-over-imessages-09402766/