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Admissibility of Event Data Recorders for
Traffic Accident Reconstruction in Illinois
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Admissibiity of Event Data Recorders
The acceptance of EDR data in Illinois stemmed from a car accident in Woodford County on November 6th, 1996.  Danielle Bachman, driving a 1996 Chevrolet Cavalier,
crossed onto the wrong side of the road and crashed head-on with a delivery van.  The cause of the crash was determined to be loss of control on Bachman’s part.

In June 1998, General Motors Corporation recalled all 1996 Chevrolet Cavaliers because of flawed calibration of vehicle sensing and diagnostic modules (SDMs), GM’s
version of an airbag control module.  Due to improper calibration, some SDMs, manufactured by Delphi Automotive Systems and Delco Electronic Systems, inadvertently
deployed the airbags during low speed crashes or when a relatively small object, such as a stone, struck the floor pan.

Bachman, and her mother, filed a lawsuit in June 1998, alleging that the SDM in Bachman’s 1996 Chevrolet Cavalier was defective, and it was an unintended deployment of
the vehicle’s airbags that caused the crash.  In their complaint, Bachman and her mother noted GM’s recall and claimed that the SDM in Bachman’s car was hypersensitive to
road surfaces on the day of the crash.

In September 2000, Bachman and her mother filed a motion to bar all testimony and evidence pertaining to the EDR crash data the defense’s experts planned to submit.  In
October 2000, in response to Bachman and her mother’s motion, the defendants requested a Frye hearing.  In determining the acceptance of expert testimony with regard to
any technology, Illinois generally follows the Frye standard.

The Frye standard was formed after Frye v. United States, a District of Columbia Circuit Court case from 1923, which addressed the admissibility of polygraph evidence.  
Under the Frye standard, it is not enough that an expert testify a particular technique is sound.  Frye creates a requirement that the scientific technique must be "generally
accepted” by the relevant scientific community.  In addition to the Frye standard, the process of assessing whether a technology is new or novel was set forth in Harris v

In most jurisdictions, including federal courts, the Frye standard has since been superseded by the Daubert Standard.  The Daubert standard was derived from the 1993
Supreme Court case Daubert v. Merrell Dow Pharmaceuticals.  This more recent standard rejects the need for "general acceptance" and calls for an independent judicial
assessment of reliability.  Under Daubert, the courts often consider if a technology has been peer reviewed and validated in addition to being commonly accepted.

During the Frye hearing for the Bachman case, on behalf of the defendants, engineers for both Delphi and General Motors presented evidence that airbag control modules,
like SDMs, are commonly used throughout the automotive industry.  Engineers went on to explain how the devices control airbag deployment and permanently record
information within their EDRs.  The defense’s experts testified that based on scientific testing by automobile manufacturers, the National Highway Traffic Safety Administration
(NHTSA), Vetronix, the Insurance Institute for Highway Safety (IIHS), and Canadian law enforcement, SDMs were known to accurately and reliably record crash data within their

Based on the evidence presented, the trial court ruled that the method of recording data within the EDR of an SDM was not new or novel.  The court also acknowledged that
EDR crash data was generally accepted within the relevant scientific community.  Therefore, the Frye standard was met and the EDR data was consequently allowed at trial.

During the November 2000 jury trial, Bachman testified that her driver airbag had deployed “out of the blue” and that the unwarranted deployment rendered her unconscious
before the crash with the delivery van.  The defendants offered expert testimony and provided recorded crash data from the EDR contained within the SDM of Bachman’s
vehicle.  Contrary to Bachman’s testimony, the defendants’ experts concluded that the SDM in Bachman’s vehicle had not malfunctioned and the vehicle deployed the airbags
as a result of the collision with the delivery van.  The trial court jury ultimately returned a verdict in favor of the defendants and against Bachman and her mother.

In 2002, Bachman and her mother filed an appeal heard by the 4th District Appellate Court of Illinois.  As the primary basis for appeal, Bachman and her mother argued that
the trial court erred in its denial of their motion in limine, which would have excluded the EDR evidence and related opinion testimony.

The appellate court disagreed with Bachman.  The trial court’s decision to allow the EDR evidence was affirmed.  In the appellate court’s opinion, EDR technology was not
new or novel and was generally accepted within its respective field.  Thus, the Frye standard had been appropriately applied with regard to EDR technology and legal
precedence was set in Illinois.

To read the full ruling,
click here.  
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