"You," she breathed. His eyes darted frantically between her and Draco, who had moved to stand beside her, one hand resting on the revolved in his waistband. "You're the one whose been brewing the opium." She studied the lab layout once more. "Yes, I'm sure of it. Not only do you clearly display signs of handling morphine on a regular basis without proper lab safety, but you also are left-handed."