Generally, last-minute additions of witnesses and substantial changes to testimony should not be admissible at trial. Failure to exclude such testimony prejudices the opposing party and constitutes reversible error.23 A party who fails to disclose a substantial reversal in an expert’s opinion does so at his peril.24
A claimed violation of the pre-trial order or other discovery violation regarding any witness, including experts, is subject to the Binger v King Pest Control25 test before a trial court can consider exclusion or other remedy.
The trial court should scrutinize a claim of newly discovered evidence with some suspicion to determine if it is just a pretext for an ambush on the other party. Otherwise, the trial becomes a free-for-all, and the discovery and pretrial deadlines become meaningless. As the Fourth district said in Office Depot, “[a] party can hardly prepare for an opinion that it doesn’t know about, much less one that is a complete reversal of the opinion it has been provided.”26
As with other discovery violations, the sanction must fit the offense. Striking the entire testimony of an expert witness is the most drastic remedy available.27
Under many circumstances, barring the expert from testifying will be too harsh.28 In cases where an expert claims to have a new opinion, for example, it is probably best to bar the new opinion rather than the expert’s entire testimony.29
When an expert is the only witness a party has to establish a key element in the case, courts should be particularly hesitant to strike the expert’s testimony.30 The same rule applies to an expert who could offer key rebuttal evidence.31 Finally, where a plaintiff’s expert has already testified to new opinions, it is proper to allow the defense expert to give new opinions in order to respond.32
Discovery disputes can sometimes arise over the role of experts retained by a party. In Carrero v. Engle Homes, Inc.,33 a trial court ordered disclosure of the names of experts a party had consulted for trial. The Fourth District Court of Appeal reversed. In doing so, it followed the well-settled rule that the names of consulting experts need not be disclosed.34 The court held, however, that a trial court has “ample authority” to strike experts if a party unreasonably delays disclosing the names of trial (as opposed to consulting) experts.35
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Source: Trial Lawyers Section of the Florida Bar
Conference of Circuit Court Judges
Conference of County Court Judges
Conference of Circuit Court Judges
Conference of County Court Judges


