Proof of causation of cancer is extraordinarily difficult in litigation. (customcollegeessays.com)
Its documented efficacy [17] suggests it would be a powerful link in the chain of causation between food advertising and obesity. (anzhealthpolicy.biomedcentral.com)
In these circumstances, very little affirmative evidence on the part of the plaintiff will justify the drawing of an inference of causation in the absence of evidence to the contrary. (macleanpersonalinjury.com)