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Profiler Optimization is a Hacking Skill available in Watch Dogs.
Profiler Optimization automatically shows Aiden which civilians have substantial hacking rewards. These rewards are Rich Bank Accounts and System Keys.
This skill places a blue square over these civilians' heads. These squares are accompanied by a low-pitched bloop, and can be seen through walls and objects.
BEWARE: These civilians have a higher chance of being Blume Affiliates