Arkansas prosecutors have dropped their case against James Bates, whom they had charged with first-degree murder partly with the help of evidence collected by an Amazon Echo smart speaker. On Wednesday, a circuit court judge granted their request to have the charges of murder and tampering with evidence dismissed.

The prosecutors declared nolle prosequi, stating that the evidence could support more than one reasonable explanation.

The move marks a curious end to a still more curious case, which had revolved around the role played by a personal assistant device that's supposed to begin recording as soon as someone says its wake word — "Alexa," in this case — in its presence.

NPR's Alina Selyukh explained the situation late last year:

"What we know from court documents is that in November 2015, a man in Arkansas had some friends over at his house to watch a football game and in the morning, one of the friends was found dead in a hot tub in the backyard. Police later charged the man who lived in the house, James Bates, with murder. He has pleaded not guilty."As the police were investigating the crime, they found a number of digital devices in the suspect's house, including an Amazon Echo device that was in the kitchen. They have since seized the device and have apparently gotten some information from it, but what they want to check is what — if anything — the device may have recorded around the time of the murder."

At the time of Victor Collins' death, the Echo had been out on the market in the U.S. for only several months, and the search warrant issued for the device's recordings prompted some fears that the new technology was opening another battlefield over personal privacy protections.

While Amazon initially declined to share data from its servers — noting the company "will not release customer information without a valid and binding legal demand properly served on us" — The Associated Press reports the company eventually "relented after Bates said he didn't mind if the technology giant shared the information."

And Alina noted the Echo wasn't the only smart device investigators cited in their case. As it turns out, they also used "information from a smart water meter, alleging that an increase in water use in the middle of the night suggests a possible cleanup around the crime scene."

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