How You Qualify A Statistics Expert Can Make Or Break Your Case

ByZach Barreto

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Updated onJuly 23, 2019

Court: Court of Appeals of IndianaJurisdiction: FederalCase Name: Johnston v. StateCitation: 69 N.E.3d 507

In this case involving Level 6 stalking, an expert sergeant was appointed by the state to examine and statistically analyze the social media records involved in the case. The defendant moved to exclude the expert’s testimony on the basis that he was not qualified to opine on statistics. Ultimately, however, the court denied the motion to exclude the testimony. The court deemed that the state and the expert both made it clear when qualifying the expert that he was a digital forensics expert conducting a statistical analysis of social media posts, not a statistics expert.

Facts

Appellant-defendant Johnston engaged in long-term stalking of victim, D.K. The stalking included, but was not limited to, phone calls, texts, and social media messages. The defendant stalked the victim over a period of three years. D.K. had requested that all contact cease on several occasions, but the defendant refused to acquiesce. D.K. eventually obtained a protective order against the defendant.

A year later, Johnston was arrested after entering D.K.’s home. Upon arrest, the defendant claimed he was unaware of the protective order. Less than one month later, the defendant returned to D.K.’s home. D.K. called the police, but they were unable to locate the defendant. Johnston returned to D.K.’s home again the next day and was promptly arrested by law enforcement.

The state charged Johnston with Levels 5 and 6 felony stalking for multiple visits to D.K.’s home. The defendant was also charged with Class A misdemeanor invasion of privacy. The State later amended these charges to add another two counts of Levels 5 and 6 felony stalking for texts and social media messages the defendant sent.

The Expert

The State presented an expert sergeant from the IMPD Computer and Digital Forensic Unit to testify as an expert in forensic and statistical analysis of the social media records and digital trails involved in the case.

By way of background, the sergeant expert testified that he trained with the Secret Service on internet investigations and that he had been trained under the commander of the Indiana State Police cyber crimes unit. The expert also had online training through the Internet Crimes Against Children. The expert gave extensive examples of the work that he had done with social media accounts. The sergeant had compiled social media information and conducted formal analyses regarding the identification of social media users.

The defendant asserted that the expert sergeant was not qualified to opine as an expert witness and that the trial court abused its discretion in qualifying him. The defendant further claimed that the expert witness did not have the requisite training in statistics to form a valid opinion about the probability of an event.

Court Discussion

The court found that the state did not present the expert witness as an expert in statistics. Rather, the sergeant was qualified as an expert in the forensic analysis of social media records and digital trails.

Thus, the court held that it did not abuse its discretion in qualifying the sergeant as an expert capable of helping the court understand the evidence regarding internet technology and social media. The defendant’s motion to exclude the expert was denied.

About the author

Zach Barreto

Zach Barreto

Zach Barreto is a distinguished professional in the legal industry, currently serving as the Senior Vice President of Research at the Expert Institute. With a deep understanding of a broad range of legal practice areas, Zach's expertise encompasses personal injury, medical malpractice, mass torts, defective products, and many other sectors. His skills are particularly evident in handling complex litigation matters, including high-profile cases like the Opioids litigation, NFL Concussion Litigation, California Wildfires, 3M earplugs, Elmiron, Transvaginal Mesh, NFL Concussion Litigation, Roundup, Camp Lejeune, Hernia Mesh, IVC filters, Paraquat, Paragard, Talcum Powder, Zantac, and many others.

Under his leadership, the Expert Institute’s research team has expanded impressively from a single member to a robust team of 100 professionals over the last decade. This growth reflects his ability to navigate the intricate and demanding landscape of legal research and expert recruitment effectively. Zach has been instrumental in working on nationally significant litigation matters, including cases involving pharmaceuticals, medical devices, toxic chemical exposure, and wrongful death, among others.

At the Expert Institute, Zach is responsible for managing all aspects of the research department and developing strategic institutional relationships. He plays a key role in equipping attorneys for success through expert consulting, case management, strategic research, and expert due diligence provided by the Institute’s cloud-based legal services platform, Expert iQ.

Educationally, Zach holds a Bachelor's degree in Political Science and European History from Vanderbilt University.

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