The IRS says it bought access to a marketing database of location data for millions of US cellphones to try to identify and track potential criminal suspects (Byron Tau/Wall Street Journal)

Byron Tau / Wall Street Journal:
The IRS says it bought access to a marketing database of location data for millions of US cellphones to try to identify and track potential criminal suspects  —  The unsuccessful effort shows how anonymized information sold by marketers is increasingly being used by law enforcement to identify suspects