Investigation is a Non-Combat Activity that focuses a character’s Perception onto an object, area, or scene/interaction in order to discover something about it. It relies on their other skills for context and is NEVER passive, and requires Concentration for more than a round of Time.
This activity does not trigger anything. Generally it trades time for safety, and requires at least 30 second to a minute minimum to to complete fully.
The Observant trait can improve the chances and outcomes of good investigation.