The Nose Knows achievement/trophy is unlocked during the Nicholson Electroplating case after inspecting the prop spinner at the blast site.

Approaching Ray Pinker triggers a cutscene explaining the scenario. Afterward, head towards the mayor who has just finished his interview to calm the local people after the morning's incident. Turn to your left and you will come to a fork in the road. Go right and follow the path around. A police officer will call you over to inspect something he has found. Interact with the object by twisting the moving part around the line up the letters. once in place hold in the position for the clue and achievement to unlock.

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