New Android app detects nearby smart glasses that could be secretly recording you. Nearby Glasses scans Bluetooth to alert users of potential cameras.

The "signal sniffer" being used in the Nancy Guthrie investigation was mounted on a helicopter on Monday.

Add Yahoo as a preferred source to see more of our stories on Google. Investigators are using a tracking device called a "signal sniffer" that can detect signals emitted from electronic devices as the ...