From Salem Wiki
- Toggles the ability to see crime scents on the ground. Scents look like exclamation points located where the crime happened.
- Right click on a scent and you can pick it up to check the perpetrator's online/offline status, and his claim direction.
- Each scent picked up adds 10 minutes of charge to the tracking window.
- One Crime will give one scent charge, so multiple Crimes committed by the same player make tracking easier.
- A picked up scent also appears in inventory as Evidence.