Robots Are Mass-Produced; Who Detects Their 'Abnormal Behavior'?

Outside the WAIC venue, a humanoid robot was directing traffic at an intersection. Its movements were fluid, showing not a hint of hesitation. I stood there watching for five minutes, but what was on my mind wasn't how intelligent it was—it was this: if its instructions were rewritten by black-market hackers or if fake data was injected into its sensors, what kind of scenario would that turn into?