"Uh huh," Bellatrix grunted skeptically. "You wouldn't be the first student with contraband in her bag, whether it is stupid or not." She had seen far worse. Of course, Lavender hadn't been that stupid but that was besides the point.
"Detention is held wherever I decide. Professor Snape has some cleaning that needs to be done and has allowed me to get that done with students I find in violation of the rules. And, if you keep asking questions, I am sure you'll be cleaning his classroom every night this week," Bellatrix threatened.
"Be there immediately after dinner, am I clear?"
Bellatrix turned on her heel and began to walk away.