The interrogation room has a nickname called the small dark room, which, apart from a big door, a table, chairs, and surveillance equipment, contains nothing else, at most just a few police officers.
In big cities or bustling places, such interrogation rooms might not exist, but in places where relationships are not complicated, they certainly do exist.
For example, in Jinhua District, there are three newly-built interrogation rooms in that police station, all about the same size as a small dark room.
In such an interrogation room, once the door is closed, no one knows what is happening inside. In other words, even if you use torture inside, there's no issue at all.
Even if the victim claims torture was used, as long as the police station says there wasn't, then there really wasn't.
"Alright, consider this meal my apology to you."