Hacker and security analyst Truman Kain has created a tool that can tell you in real-time if you're being followed while driving your Tesla. The "Surveillance Detection Scout" hack scans license plates and uses facial detection to create an in-depth log of cars your Tesla spots using its Sentry Mode camera software suite. The list can then be accessed by the driver, and each license plate can be labelled as "linked to friend," "high risk," or "usual." The app can even show you the exact route each detected driver took on a map, including video footage. Kain released the source code for the tool this weekend at DefCon, an annual hacker convention in Las Vegas, Nevada. It's not exactly clear who Kain is targeting with the tool.