Category: Evidence · Statute: F.S. 90.702 · Source: Florida Legislature
Understanding Expert Witness in Florida
In Florida courts, an expert witness is a specialist permitted to offer opinion testimony to help the judge or jury understand complex scientific, technical, or specialized issues. Under Section 90.702 of the Florida Evidence Code, which adopts the federal Daubert standard, a witness may only testify as an expert if their specialized knowledge will assist the trier of fact, their testimony is based on sufficient facts or data, and their methods are reliable and reliably applied to the case. Unlike lay witnesses, who can only testify about what they personally saw, heard, or experienced, expert witnesses are uniquely permitted to draw conclusions and express professional opinions within their field of expertise.
The need for an expert witness typically arises when a criminal case involves evidence that goes beyond the common knowledge of an average citizen. For example, the prosecution or defense may retain forensic toxicologists to interpret blood-alcohol content, medical examiners to establish a cause of death, or digital forensics experts to analyze cell phone location data. Before these professionals can testify in front of a jury, the trial judge acts as a "gatekeeper," conducting a rigorous review to ensure the expert's credentials and scientific methodology meet Florida's strict evidentiary standards.
How Expert Witnesses Impact Bail and Pretrial Release
Expert witnesses can play a critical role during pretrial detention and Arthur hearings, where a judge decides whether to grant bail for non-bondable offenses. The defense may present testimony from a forensic psychologist to demonstrate a defendant's mental instability or lack of future dangerousness, or a medical expert to show that a specialized health condition cannot be adequately treated in jail. Conversely, the state may use a threat-assessment expert to argue that the defendant poses a flight risk or a danger to the community, directly influencing the judge's decision to set, deny, or reduce a bail bond.