Background
Neckson Faustin appealed his convictions and sentences for two counts of vehicular homicide and one count of reckless driving causing property damage. He also appealed a related order revoking his probation and imposing sentence.
At trial, Detective Michael Wiley testified about the vehicles’ speeds using a “momentum formula.” Although Wiley was not an accredited accident reconstructionist, the trial court admitted his calculations as lay testimony concerning his investigation. Wiley relied on averaged vehicle weights obtained online, calculated departure angles using Google Maps and a protractor, assumed one vehicle’s approach angle was zero, and could not produce the field sketch underlying his calculations.
The Court’s Holding
The Fourth District held that Wiley’s speed calculations constituted expert opinion because they depended on specialized knowledge and methodology. The trial court therefore erred by admitting the testimony without performing the reliability and qualification analysis required by section 90.702, Florida Statutes, which codifies the Daubert standard.
The error was not harmless beyond a reasonable doubt. Wiley’s calculations purported to corroborate event-data-recorder evidence on the central question of reckless driving, and testimony showed that the recorder data could not be reliably interpreted without independent accident reconstruction. The court reversed the substantive convictions and sentences and remanded for a new trial, while affirming the trial court’s other rulings, including its use of a six-person jury.
In the probation-violation case, the court found Faustin’s challenge to the revocation inadequately briefed and affirmed the revocation. Because the substantive convictions were reversed, however, the court vacated the probation-violation sentence and remanded for resentencing using a corrected scoresheet.
Key Takeaways
- An officer’s collision-speed calculation based on a specialized formula is expert opinion, not merely lay testimony about an investigation.
- A trial court must apply section 90.702’s reliability requirements before admitting specialized accident-reconstruction testimony.
- The improper testimony was not harmless because it purported to corroborate disputed speed evidence bearing directly on recklessness.
Why It Matters
The decision reinforces that specialized testimony cannot avoid expert-evidence scrutiny simply because it is offered by an investigating officer. When an opinion depends on technical formulas, assumptions, and case-specific measurements, the proponent must establish the witness’s qualification and the methodology’s reliable application.
The ruling also illustrates the consequences of reversing convictions used in sentencing for a separate probation violation: the revocation may remain intact, but resentencing may be necessary on a corrected scoresheet.