"Annoying me is not a valid reason no matter what you think," he said with an amused smile.
Percy took the file, but didn't open it. He'd learnt working for Tiberius that things weren't as black and white as they thought. Some things were illegal but needed to exist. Not everyone could afford paying Malfoy's prices for his potions, and they would go where they could.
"Do you think so? What happens when someone can't afford a potion and can't find it elsewhere? Are we sending them abroad where we have no control? Do we watch people die because they make them themselves?" He put the file down and rested against the chair. "I can't possibly tell not to investigate a crime, however before you go in like... like a Gryffindor, you might want to consider what you are doing. This people provide a lot of potions that are necessary and that people simply can't get anywhere else."