Forensic toxicology is the application of toxicology to legal matters, evaluating how drugs, alcohol, and chemicals affect human performance and biological systems in the context of litigation and insurance claims.
What Does a Forensic Toxicologist Do?
A forensic toxicologist evaluates the adverse effects on a biological system including how drugs, alcohol, and chemicals affect human performance in legal and insurance matters. They interpret laboratory results, assess impairment, reconstruct exposure timelines, and provide expert opinions to support litigation and claims investigations.
Learn more from Amanda Kogelschatz, M.S., D-ABFT-FT, a Rimkus Forensic Toxicologist, in her Q&A blog post here.
How Does Forensic Toxicology Support Litigation and Claims?
Forensic toxicology plays a critical role in understanding whether substances contributed to an incident, injury, or outcome. Experts in forensic toxicology help legal teams evaluate evidence and clarify complex issues.
Typical areas of support include:
- Toxicology data review
- Evaluation of laboratory results, testing methods, and chain of custody
- Impairment analysis
- Assessment of the inward and outward effects that substances may have on an individual
- Exposure and dose evaluation
- Determination of whether a substance level is consistent with reported use or exposure
- Alcohol Timeline reconstruction
- Estimation of blood alcohol concentration levels at a specific point in time
- Expert reporting and testimony
- Translation of scientific findings into clear, defensible opinions for legal proceedings
Key Toxicology Concepts in Legal Cases
Understanding toxicology evidence requires familiarity with several core concepts:
- Forensic toxicology
- The application of toxicology to legal matters
- Retrograde extrapolation
- A scientific calculation used to estimate BAC at an earlier time
- Dose-response relationship
- The relationship between the amount of a substance and its physiological effect
- Pharmacokinetics
- How a substance is absorbed, distributed, metabolized, and eliminated by the body
Common Questions About Forensic Toxicology
What does a toxicology expert witness evaluate?
A toxicology expert witness evaluates whether drugs, alcohol, or chemicals were present, how they may have affected an individual, and whether they could have contributed to an incident. This includes interpreting lab results, assessing impairment, and identifying limitations in testing or data.
What is BAC retrograde extrapolation?
Retrograde extrapolation is a calculation used to estimate a person’s blood alcohol concentration at a prior time, such as the time of an incident or time of alcohol service.
How reliable are toxicology test results?
Toxicology results can be highly reliable when proper testing methods and procedures are followed. However, experts also evaluate potential limitations, including sample handling, testing variability, and timing of collection.
What types of cases involve toxicology experts?
Forensic toxicologists are commonly involved in:
- Motor vehicle accidents involving suspected impairment
- Dram shop and alcohol liability cases
- Workplace incidents and exposure claims
- Drug-related injuries or fatalities
- Environmental or chemical exposure cases
Example Applications in Legal Matters
Forensic toxicology expertise may be applied in cases involving:
- Alcohol or drug impairment in transportation incidents
- Prescription or illicit drug effects on human performance
- Chemical exposure and potential health impacts
- Interpretation of post-incident toxicology reports
- Evaluation of conflicting or incomplete toxicology data
Why Does Toxicology Expertise Matter?
Toxicology evidence is often complex and requires careful interpretation. Laboratory results alone may not fully explain what occurred. A qualified forensic toxicologist provides context, evaluates limitations, and applies scientific principles to support accurate understanding of the evidence.
Summary: Forensic Toxicology in Litigation
- Evaluates the effects of drugs, alcohol, and chemicals
- Assesses impairment and human performance
- Interprets laboratory testing and limitations
- Reconstructs exposure timelines
- Supports litigation and claims with expert analysis and testimony
Work With a Forensic Toxicology Expert
Rimkus experts provide toxicology analysis for litigation and insurance matters, helping clients understand complex scientific evidence and make informed decisions.
Learn more about our broad range of services on the Toxicology and Food Safety page.
Published March 27, 2026.
This blog post is intended to provide general information and insights into prevailing industry practices. It is not intended to constitute, and should not be relied upon as, legal, technical, or professional advice. The content does not replace consultation with a qualified expert or professional regarding the specific facts and circumstances of any particular matter.