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Lawyers representing a man convicted of six robberies in the Detroit area have now filed their opening brief at the Supreme Court in one of the most important digital privacy cases in recent years.

This case, Carpenter v. United States, asks a simple question: is it OK for police to seize and search 127 days of cell-site location information (CSLI) without a warrant?

Previously, lower courts have said that such practices are compatible with current law. But the fact that the Supreme Court agreed to hear the case suggests that at least four justices feel that perhaps the law should be changed.

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