§ 2034.290.Retention of original demand, with proof of service, and original expert

This section treats expert witness exchange paperwork the same way the discovery act treats most other discovery: it stays between the parties unless a dispute pulls it into the courtroom. The demand for exchange itself, along with every expert witness list and declaration exchanged in response to it, is not filed with the court. That keeps the court file focused on matters in dispute rather than accumulating the routine back-and-forth of expert disclosure.

Someone still has to hold on to the paper, and this section assigns that job to the party who made the demand. That party must keep the original demand, with the original proof of service attached, along with the originals of every list and declaration exchanged in response, until six months after the action reaches final disposition. Once that period runs, the originals may be destroyed, unless a court, on a motion by any party and for good cause shown, orders them preserved longer. And the general no-filing rule gives way whenever the demand or the exchanged lists and declarations become relevant to an issue pending in the action; at that point they must be lodged with the court rather than kept off the record.