Source: Eberron Campaign Setting
You can use the Search skill to find and analyze clues at the scene of a crime or a mystery.
Benefit: This feat expands the way you can use the Search skill by allowing you to notice and analyze available clues in a specific area. This use of the Search skill is a full-round action. Clues are pieces of evidence that lead to the solution of a mystery. Clues are physical and can be seen, heard, touched, smelled, or tasted. A clue stands out because it's not a normal feature of the area being searched. Examples of clues include a trampled flower-bed, a broken urn, a pin snapped off in a lock, a torn strip of cloak, a burnt scrap of scroll, or a brooch clutched in a dead man's fist.