@bobo -- the problem is no different working with embedded microcontroller systems. If there is no trace and debug capability, no access to source code, you have very limited observations to make. Unless the debug was built-in, you are out of luck.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.