'Yes, we do,' said John. there was a noise in the room. Someone near Christine shouted something angrily, and a policewoman told him to be quiet. John went on. 'Of course we put these chemicals in the river, but we don't put a lot in. Only two or there hundred litres every day. That's not much. And we check the river all the time-three every day. there are usually only two parts per million, or less, in the water near the factory, and there is much less downstream. That's not dangerous.'