How an Accident Reconstructionist and ASE-Certified Mechanic Proved a Stuck Accelerator

When a high-speed crash kills a passenger, prosecutors typically assume the driver is at fault. After all, they look at the speed, the damage, and the witness statements—and then they charge vehicular homicide.

However, sometimes the driver is not at fault. In certain cases, the vehicle itself is the cause. A stuck accelerator, a brake failure, or a mechanical defect—any of these can turn an ordinary drive into an uncontrollable disaster.

Consequently, proving mechanical failure requires more than a typical accident reconstructionist. Instead, it requires someone who can analyze both the crash dynamics and the vehicle itself. In this case, an expert who combined accident reconstruction expertise with ASE mechanic certification found the evidence that changed everything. I am Tampa Criminal Defense Attorney Rocky Brancato. This post is part of our forensic series put out by the Brancato Law Firm, P.A., your Tampa criminal forensic evidence law firm.

The Case: A Fatal Crash and a Grieving Friend

My client was driving with his friend as a passenger when his vehicle crashed into a tree at high speed. Tragically, the impact killed his friend instantly.

Before the crash, neighbors heard the engine roaring. Subsequently, police measured the damage, estimated the speed, and concluded that my client had driven recklessly. As a result, they charged him with vehicular homicide.

However, my client told a different story. According to him, the accelerator got stuck. No matter what he did, he could not slow down. The crash was not his fault—it was the car’s.

The question was whether we could prove it.

The Prosecution’s Theory: Reckless Driving

The state built a straightforward case based on three key points:

• First, neighbors heard the engine roaring—which they cited as evidence of excessive speed
• Second, the vehicle struck a tree at high velocity—which they presented as evidence of loss of control
• Third, a passenger died in the crash—the tragic result that the prosecution attributed to the driver’s conduct

To the prosecution, therefore, the conclusion seemed obvious: the driver was speeding, lost control, and killed his passenger. In their view, this constituted vehicular homicide.

Nevertheless, the prosecution never examined the vehicle itself. Instead, they assumed driver error without investigating whether mechanical failure could explain what happened.

The Expert: Two Disciplines in One

To challenge the prosecution’s theory, I retained an expert with a unique combination of qualifications: he was both an accident reconstructionist and an ASE-certified mechanic.

This combination proved critical for our defense. While a typical accident reconstructionist can analyze crash dynamics—speed, impact angles, and vehicle trajectories—proving mechanical failure requires someone who can also get under the hood and identify what went wrong with the vehicle itself.

The Investigation: Examining What the Police Ignored

My expert conducted a comprehensive examination of the vehicle. Rather than simply looking at the crash damage, he examined the mechanical systems that controlled acceleration and braking.

His findings proved significant: the vehicle had issues with the accelerator that caused it to get stuck.

Importantly, this conclusion rested on physical evidence from the vehicle itself—not speculation. Moreover, this represented evidence that the prosecution had never bothered to examine.

What the Expert’s Findings Meant

The stuck accelerator explained everything about this crash:

• It explained why neighbors heard the engine roaring—because the accelerator was stuck open
• It explained why the vehicle traveled at high speed—because the driver could not reduce power to the engine
• It explained why my client lost control—because he was fighting a vehicle that would not respond to his inputs
• It explained why braking alone could not prevent the crash—because with the accelerator stuck, the engine continued producing power even as the driver tried to stop

In other words, my client did not drive recklessly. Instead, he became a passenger in his own vehicle—trapped behind the wheel of a machine that had malfunctioned and would not obey his commands.

The Impact on the Case

The expert’s findings fundamentally changed the nature of the case. As a result, this was no longer a simple vehicular homicide prosecution based on reckless driving. Instead, there was now credible evidence that mechanical failure—not driver misconduct—caused the crash.

Consequently, the prosecution faced a difficult choice: take the case to trial and risk a jury believing the mechanical failure defense, or negotiate a resolution that reflected the true nature of what happened.

Types of Mechanical Failures That Can Cause Crashes

What This Case Teaches About Vehicular Homicide Defense

• First, do not assume the driver is at fault. High-speed crashes can result from mechanical failure, not just reckless driving. Therefore, the vehicle itself must be examined.
• Second, retain an expert who can perform both crash analysis and mechanical inspection. An accident reconstructionist who also holds mechanic certification can connect the crash dynamics to the mechanical failure.
• Third, preserve the vehicle immediately. If mechanical failure is a potential defense, the vehicle must remain intact for expert examination. Once someone destroys or repairs it, the evidence disappears.
• Fourth, challenge the prosecution’s assumptions aggressively. Prosecutors often assume driver error without investigating alternatives. Consequently, a thorough defense investigation can reveal evidence they missed.
• Finally, understand that mechanical failure can transform the entire nature of the case. What initially looks like reckless driving may actually represent a driver fighting to control a malfunctioning vehicle.

Frequently Asked Questions

Can mechanical failure serve as a defense to vehicular homicide?

Yes, it can. If a mechanical failure—such as a stuck accelerator, brake failure, or steering malfunction—caused the crash, the driver may not have had any ability to prevent it, regardless of how carefully they drove. As a result, this can serve as a complete defense or provide a basis for reduced charges.

What does an accident reconstructionist do?

An accident reconstructionist analyzes physical evidence from vehicle crashes to determine what happened. Specifically, they examine skid marks, vehicle damage, road conditions, and other factors to calculate speeds, impact angles, and the sequence of events leading to a collision.

What does ASE certification mean?

ASE (Automotive Service Excellence) certification represents an industry credential for automotive technicians. To earn this certification, mechanics must pass rigorous testing in specific areas of vehicle repair. In legal cases, an ASE-certified expert can credibly testify about mechanical defects and failures.

Why do I need an expert who combines reconstruction and mechanical expertise?

A typical accident reconstructionist can analyze crash dynamics but may lack the expertise to identify mechanical failures. Conversely, a mechanic can identify defects but may struggle to connect them to the crash itself. However, an expert with both qualifications can examine the vehicle, identify the mechanical failure, and explain precisely how it caused the crash.

What steps should I take if I believe a mechanical failure caused my crash?

Above all, preserve the vehicle. Do not allow anyone to repair, sell, or destroy it until a qualified expert has examined it. Additionally, tell your attorney immediately so they can retain an expert and ensure the evidence remains protected.

How does Florida law define vehicular homicide?

Under Florida Statute 782.071, vehicular homicide occurs when someone causes the death of a human being by operating a motor vehicle in a reckless manner likely to cause death or great bodily harm. The state classifies this offense as a second-degree felony punishable by up to 15 years in prison. However, if the driver knew or should have known the crash occurred and failed to render aid, the charge becomes a first-degree felony.

Facing Vehicular Homicide Charges?

A fatal crash does not automatically mean the driver bears fault. After all, mechanical failures happen—and when they do, the driver may have had no ability to prevent the tragedy.

For over 25 years, I have defended clients against serious charges throughout Tampa Bay. As a result, I know how to investigate what really caused a crash, retain qualified experts who can examine both crash dynamics and mechanical systems, and present evidence that challenges the prosecution’s assumptions.

Call (813) 727-7159 for a Confidential Consultation

The Brancato Law Firm, P.A.

620 E. Twiggs Street, Suite 205, Tampa, FL 33602

Serving Hillsborough, Pinellas, and Pasco Counties

Part of the Forensic Evidence Series

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