RACHEL MARTIN, HOST:
In a ruling seen as a major victory for privacy rights in the digital age, the U.S. Supreme Court this morning has ruled that police need a search warrant to track people's cellphone locations. For more on what this means, we're joined by NPR legal affairs correspondent Nina Totenberg. Nina, thanks for being here.
NINA TOTENBERG, BYLINE: My pleasure.
MARTIN: On its face, this seems like a highly consequential ruling.