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Review of Case Materials
Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.
Provide Expert Analysis
Applies specialized knowledge and experience to evaluate the technical or professional issues involved.
Form Expert Opinions
Develops independent, supportable opinions based on the available evidence and relevant standards.
Prepare Expert Reports
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A breathalyzer expert witness may consider the breath-testing instrument used, testing sequence, reported breath alcohol concentration, operator records, calibration and quality-control documentation, inspection and maintenance history, and circumstances surrounding the test. These records can help determine what the instrument measured and whether a documented technical or procedural issue could affect the reliability or interpretation of the result.
No. Blood alcohol concentration, or BAC, measures the concentration of ethanol in the blood, while impairment refers to changes in functions such as judgment, coordination, attention, and reaction time. Higher BAC levels are generally associated with greater impairment risk, but the observable effects can vary among individuals. A BAC result may therefore be considered alongside driving behavior, observed signs, drinking history, medications, medical factors, and other relevant evidence.
A forensic toxicologist may use retrograde extrapolation to estimate an earlier alcohol concentration based on the measured result, testing or specimen-collection time, drinking history when available, and scientifically supported assumptions about alcohol absorption and elimination. Because these processes vary among individuals, particularly during the absorption phase, the assumptions and uncertainty of the calculation should be identified. A back-calculated concentration should not be presented as an exact measurement of the person’s alcohol level at the earlier time.
A preliminary breath test is commonly used as a portable roadside screening tool during an impaired-driving investigation. An evidential breath test is performed with an instrument intended to meet established specifications for quantitative breath alcohol testing and is subject to applicable quality-assurance requirements. The legal use and admissibility of either result depend on the jurisdiction and the circumstances of the test.
Prepares clear, well-supported expert reports outlining methodology, analysis, findings, and opinions.
Provide Deposition Testimony
Explains findings and opinions under oath and responds to questioning during deposition testimony.
Testify in Court
Presents specialized findings and opinions clearly to judges, juries, arbitrators, or other decision-makers.
Forensic toxicology expertise may be relevant when the disputed issues involve measurement of ethanol in blood or breath, specimen integrity, analytical methods, breath-testing instruments, alcohol absorption and elimination, retrograde extrapolation, or interpretation of toxicology findings. Medical toxicology may be more appropriate when the central issue involves clinical intoxication, poisoning, overdose, or medical treatment, while addiction medicine may be relevant when the dispute concerns a substance use disorder and its diagnosis or treatment.
