By Sterling Anthony, CPP, expert witness in packaging, warnings, patent-infringement, cargo loading & securement, and insurance claims regarding cargo.
If there’s one answer that some testifying experts seem to have a hard-wired reluctance to utter it’s, “I don’t know.” By virtue of being an expert, that person is presumed to be knowledgeable; nonetheless, being omniscient is not in the job description.
There is nothing inherently wrong for an expert to say, “I don’t know.” In all instances it’s an admission, an acknowledgement, a confession, a concession; however, in no instance should it be a mea culpa.
There are answers that a testifying expert should have at the ready. That’s because, by then, the expert should be acquainted with the case file. In addition, by then, the expert should have been prepped, told what will be asked by the attorney-client and what might be asked by the opposing attorney. Having that storehouse of knowledge, an expert should bring a quiet confidence to the proceedings, committed to listening to the questions, understanding the questions, taking time to formulate answers, and, then answering truthfully. If that last step dictates an, “I don’t know,” so be it.
There are various ways that an expert can mishandle not knowing an answer; however, the worse is to give an answer that is factually incorrect. The consequence to the thusly exposed expert is not just embarrassment but discredit. Almost as bad is to deal in conjecture. Even if the expert’s preamble is, “I’m guessing…,” a fundamental principal of testifying will have been breached.
An expert should guard against beginnings that are defensive and apologetic, as exampled by, “I’m sorry, but I don’t know,” or, “I’m afraid I don’t know,” or, “I must admit, I don’t know.” Some opposing attorneys have a talent for triggering such responses through voice inflection, body language, eye-contact with the jury, or other tactics meant to imply that a reasonable expectation is for an answer other than, “I don’t know.”
If the follow-up question is “Why don’t you know?” the expert should not be intimidated, no matter how incredulously the question is posed. In the absence of a sustained objection by the attorney-client, an expert should be able to answer in a way that does not bespeak dereliction.
An expert should be aware that a line of questioning by opposing counsel might be designed to repeatedly draw the response, “I don’t know.” The expert should not succumb to concerns over being regarded as unknowledgeable nor to concerns over diversifying the responses. An expert who has come adequately prepared is not the best target for the aforementioned line of questioning, the reason being that opposing counsel will need to go increasingly farther afield to sustain the tactic. The opposing counsel who ventures into the irrelevant is not immune to taxing the patience of the Court and jury.
An expert should not confuse, “I don’t know,” with, “I don’t recall.” The latter should be reserved for instances in which the expert either once knew or might have known something but presently can’t bring it to mind. “I don’t recall,” is difficult to disprove; even so, an expert should not resort to it dishonestly. One who does might have the memory “refreshed” by being shown what was said in a deposition, for example. At such time, the jury will be keyed in, forming impressions on whether the I-don’t-recall claim was truthful.
An expert should never utter, “I’m not sure,” unless in association with having been asked, “Are you sure?” Then again, if the expert was not sure, the initial response should have been, “I don’t know.” Relatedly, when giving an estimate, the expert should let it be known that the response is an estimate; otherwise, “I don’t know,” is the advised response.
In summary, an expert should know that an essential part of testifying is the effective use of, “I don’t know.”
Sterling Anthony, CPP, is a consultant to the industrial, institutional, and government sectors and an expert who provides services to the legal community. He is a former manager at Fortune 100 companies and a former instructor at two major universities. His contact information is: 100 Renaissance Center-Box 43176, Detroit, MI 48243; (office) 313-531-1875; (cell) 313-623-0522; (fax) 313-531-1972; thepackagingexpertwitness@gmail; www.thepackagingexpertwitness.com