Leonardo's SignalTrace links device signals to license plate readers

Italy's Leonardo has unveiled SignalTrace, a system that picks up signals from phones, smartwatches, fitness trackers and RFID tags and correlates them with license plate reader data. The company says it does not decrypt device contents or communications and that collected data stays with law enforcement agencies.

• System builds an "electronic signature" from phone, watch and tag signals
• Data is matched to vehicle plates and stored until an investigator queries it
• Leonardo says it does not read device contents or communications
• Study: four time-and-place points uniquely identify 95% of people