Exposure to potentially harmful substances at some level is a fact of modern life. These substances are everywhere — in the air we breathe, in the food we eat, and in the water we drink — and many of these substances are naturally occurring. It is impossible to have zero exposure to all of them.
For both science and law, however, the issue is not whether someone has some detectable exposure. Rather, it is whether the dose was sufficient (in quantity and duration) to cause harm.
In a regulatory setting, the question posed is what level of exposure creates an unreasonable risk of harm. In a lawsuit, however, the alleged harm has already occurred, usually in the form of a disease that has many possible causes. The question is causation.
Continue Reading Seventh Circuit Ruling On Scientific Evidence Closes Some Doors But Opens Others