Okay. I understand.
I think it was Dr. Pearson who was saying that it's really very, very hard to pinpoint the source of pollution when you're applying the Fisheries Act, and that really is a discouraging remark, because how can we apply the Fisheries Act if, as you say, you can't point a finger at one particular farmer or one particular industrial source? Is this an intractable problem?
For example, we've been studying the oil sands and the impact the oil sands may be having on fish habitat. It sounds as if you're telling us to give up because we're talking about cumulative impacts and you can't find a point source of pollution.