            Ollivander put a finger to his chin, lost in thought for a long moment before answering. "I confess that traces are not my area of expertise, but I have picked up a basic understanding over the years. Your ability to use the Magometer gives us some clue," he said, tapping his chin as he studied Sirius. "Somehow, your resurrection has prompted the Improper Use of Magic Office to identify you as underaged."