Why was it that the young so often overlooked the obvious. "Slughorn has his notes. You have only to mine his memories," he said, scowling. "A competent Legilimens should be more than capable of extracting them. Or, barring that, simply asking the Headmistress for use of the penseive would surely suffice. Best get to that before the culprit disposes of that piece of evidence as well."