From Engineering to Expert Testimony: John C. Sotter's Role in Slip and Fall Investigations

Slip and fall cases are often viewed through a legal lens, but long before they reach a courtroom, they become engineering matters that require careful technical evaluation. Determining why a person lost traction, whether a walking surface performed as expected, whether maintenance practices contributed to the incident, and whether a hazard could have been identified before the injury occurred requires more than observation or opinion. It demands scientific analysis, technical expertise, and an understanding of how flooring systems perform under real-world conditions. Throughout his career, John C. Sotter has built his reputation by applying engineering principles to these complex investigations. In his view, when a hazard could have been identified through proper testing beforehand, the resulting injury is not an “accident” — it is the foreseeable outcome of an inappropriate flooring choice.

As a floor safety consultant and expert witness, Sotter has spent more than three decades examining incidents involving pedestrian injuries across commercial, industrial, and public environments. His work bridges the gap between engineering science and legal proceedings by providing objective evaluations of walking surfaces based on measurable evidence rather than speculation. In a field where technical accuracy can influence significant legal outcomes, his role has centered on explaining the facts behind floor performance with clarity and precision.

Every slip and fall investigation begins with one fundamental objective: determining exactly what happened. While eyewitness accounts and security footage may help reconstruct an event, they rarely explain why a surface behaved the way it did. Engineering analysis fills that gap by examining the interaction between the pedestrian, footwear, the walking surface, and the environmental conditions present at the time of the incident.

Sotter’s investigations typically involve a detailed assessment of the location where the injury occurred. This process includes examining flooring materials, documenting environmental conditions, reviewing maintenance records, evaluating cleaning procedures, and conducting scientific slip resistance testing. Rather than relying on appearance-based assumptions, he focuses on collecting measurable data that can be independently evaluated and verified.

One of the defining characteristics of his work is the emphasis on objective testing. Floor surfaces that appear safe may not always provide adequate traction when exposed to water, cleaning products, oils, or other contaminants. Likewise, a visually worn floor is not automatically hazardous. Accurate conclusions depend on testing methods that measure how a surface actually performs under conditions similar to those present during the incident. This reliance on measurable evidence helps reduce subjective interpretation and supports more reliable engineering findings.

This scientific approach has made expert testimony an important extension of Sotter’s engineering practice. Courts often rely on specialists who can explain technical findings in a manner that judges and juries can understand. Translating engineering concepts into clear and practical language requires more than technical knowledge. It also requires the ability to present complex evidence without sacrificing scientific accuracy or professional objectivity.

In many cases, his responsibility is not to advocate for one side but to evaluate the available evidence independently. Engineering experts are expected to analyze facts using recognized testing procedures and accepted professional standards regardless of which party has requested their services. This impartial approach strengthens the credibility of technical findings and supports informed decision-making throughout the legal process.

The range of environments examined during Sotter’s career reflects the broad scope of pedestrian safety challenges. His consulting assignments have included hotels, restaurants, hospitals, office buildings, educational institutions, retail centers, industrial facilities, and public infrastructure. Each environment presents different operational demands, maintenance practices, and flooring materials, requiring investigators to understand how these factors influence traction and pedestrian movement.

Healthcare facilities, for example, require rigorous cleaning routines to maintain sanitary conditions, while restaurants regularly deal with food spills and changing floor conditions throughout the day. Industrial facilities may introduce oils, chemicals, or specialized coatings that affect traction, while shopping centers experience continuous pedestrian traffic that gradually alters surface characteristics. Understanding these differences allows engineering investigations to evaluate each location within its specific operating environment rather than relying on generalized assumptions.

Sotter’s experience extends well beyond the United States. His investigations have taken him to England, Canada, Mexico, and nearly every American state. He has also conducted evaluations aboard cruise ships, where floor safety presents unique challenges because of changing weather conditions, moisture exposure, and constant passenger movement. Working across multiple jurisdictions has provided valuable insight into how different industries approach risk management and surface evaluation while maintaining consistent engineering principles.

Another important aspect of expert witness work involves documentation. Technical reports prepared after an investigation often become central pieces of evidence during litigation. These reports clearly describe testing procedures, document observations, present measured results, and reference recognized engineering standards where appropriate. Thorough documentation allows findings to remain transparent and capable of independent review by other professionals involved in the case.

Sotter’s long involvement with recognized testing standards has strengthened this aspect of his work. Familiarity with established procedures allows investigations to be conducted using methodologies accepted within the engineering community. Standardized testing also improves consistency, making it easier for other specialists to evaluate, compare, and verify the results obtained during an investigation.

Not all testing methods carry equal weight in Sotter’s assessments, however. He has been critical of certain test methods developed within the United States, often by flooring manufacturers and expert witnesses whose primary experience is litigation testimony, that are not recognized outside the United States. In his view, these methods were designed largely to help insurance companies and manufacturers argue that slippery floors are not, in fact, slippery, allowing hazardous flooring products to remain in commercial use. Outside the United States, regulators and safety professionals instead rely on the pendulum floor slip resistance tester, a scientifically validated instrument used internationally to evaluate walking surfaces and identify hazards before pedestrians are injured.

Expert testimony also serves an educational purpose. Many legal professionals encounter engineering concepts only when handling technically complex cases. Clear explanations of slip resistance measurement, environmental influences, and flooring performance help courts better understand the scientific issues behind pedestrian injuries. Effective communication ensures that technical evidence contributes meaningfully to legal proceedings without becoming unnecessarily complicated.

While litigation often focuses on past events, engineering investigations frequently lead to improvements that reduce future risk. Identifying the factors that contributed to one incident encourages property owners to modify maintenance practices, improve cleaning procedures, upgrade flooring systems, or introduce routine slip resistance testing. In this way, expert analysis extends beyond individual cases and supports broader public safety objectives.

Advances in flooring technology continue to create both opportunities and challenges for investigators. Decorative finishes, innovative coatings, engineered stone products, and evolving maintenance systems all influence surface performance. Keeping pace with these developments requires continuous learning, ongoing testing, and a commitment to applying established engineering principles to new materials and construction practices.

Throughout his career, John C. Sotter has demonstrated that effective expert testimony begins with sound engineering. By combining scientific testing, careful documentation, and objective analysis, he has helped courts, property owners, and safety professionals better understand the factors that contribute to slip and fall incidents. His work illustrates how engineering expertise can provide clarity in situations where opinions alone are insufficient, reinforcing the importance of evidence-based investigation in protecting public safety and supporting fair, technically informed decision-making.