text:  You know, the problem is they might tighten it up in one area. So there was the famous melamine scandal where infant milk powder was being bolstered by melamine. So in that area, they clean it up. But then it just emerges somewhere else. That was Stephen McDonnell, our Beijing correspondent, talking to me a little earlier. You're listening to NewsHour from the BBC. Do stay with us. We've got lots more coming up in the second half of the programme.