Surveillance technology like the Fusus camera network and license plate readers has drawn widespread scrutiny in Nashville — but other surveillance technologies remain more secretive. Chief among them is a powerful phone-hacking device called GrayKey used by the Metro Nashville Police Department and several other law enforcement agencies throughout Tennessee.

In a case study published last year , digital investigation software provider Magnet Forensics boasted that MNPD uses a suite of its products, including GrayKey, to unlock and extract data from suspects’ smartphones. GrayKey can retrieve everything from text messages and call logs to app data, location history and even deleted files.

“When the security threat team obtains a suspect’s mobile device, they submit it to MNPD exami

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