Amazon Echo Now An Expert Murder Witness?

Cops have asked Amazon to reveal any audio it might have stored after a man is murdered in a hot tub in Arkansas. The crime, committed in Bentonville, happened in a hot tub, but police found an Echo at the scene and wanted Amazon to unlock any audio it has sent to its cloud servers. Amazon refused, demanding a warrant first. Over on Slashdot the argument started quickly about the merits of allowing a device into your home that can listen to every word you say. Amazon, for its part, assured journalists at the UK launch of the product that it only ever saves audio directly after the keyword is spoken to trigger the unit.