Snape looked supremely, icily unimpressed. "If I thought you were incapable, I would never have contemplated hiring you. The fact remains that the Ministry, the Aurors, the MLE, the parents, and sundry other free agents with a grudge, are all bound and determined that there shall not be the slightest suspicion of Dark Arts attached to this school. And as Headmaster, I am not about to sell either my own reputation or the reputation of Hogwarts down the river, simply to shield either or both of you from the consequences of your own extracurricular hobbies."