Where do you find a medical expert to testify in court?

Question

To show how sewage made someone sick.

Answer 1

Find a scientific study on this exact subject. Then hire this person as your expert. Find a court case on this subject and see if any experts testified. You might go to the nearest law library to get help finding this information. The librarians tend to be very helpful.

Answer 2

That may be difficult, and the expert you need is going to be shaped to a large degree by the specific findings of the treating physician, who will need to be included as the first expert witness. Without knowing more specific details, there's no way to give you a useful answer.