Here is a slide deck from DEFCON on it: https://media.defcon.org/DEF%20CON%2022/DEF%20CON%2022%20presentations/DEF%20CON%2022%20-%20Grant-Bugher-Detecting-Bluet

Here is a slide deck from DEFCON on it: https://media.defcon.org/DEF%20CON%2022/DEF%20CON%2022%20presentations/DEF%20CON%2022%20-%20Grant-Bugher-Detecting-Bluetooth-Surveillance-Systems-Updated.pdf https://media.defcon.org/DEF%20CON%2022/DEF%20CON%2022%20pre...