For example, if any employee engineer designed a product that was the subject of a product liability case, it would be difficult to separate the engineer’s sense impressions leading up to the design of the product with his expert opinions at trial, and to distinguish between attorney communications regarding the former from those regarding the latter.
There are reasonable grounds to believe that broad discovery may be appropriate as to some “no-report” experts, such as treating physicians who are readily available to one side but not the other.
While it is desirable that any testifying expert’s opinion be untainted by attorney’s opinions and theories, it is even more important that a witness who is testifying regarding his own personal knowledge of fact be unbiased.