"But they can't just arrest you for being muggleborn, can they? Won't they just end up interviewing you and saying something or making you carry something that says you're muggleborn and then just let you go again anyway? Plus people would be brassed if they tried to arrest any of us," Merton offered, taking a bag of crisps and perching on the arm of Gideon's chair this time.
He didn't actually eat the crisps, just toyed with the bag to make it crinkle.