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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
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.
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Testing may be central when parties disagree about THC or other cannabinoid concentrations, product composition, labeling, or the reliability of a reported result. Relevant technical questions can include sample preparation, the analytical method used, quality-control procedures, moisture measurements, calculations, and whether the laboratory's documentation supports its conclusions. NIST's Cannabis Laboratory Quality Assurance Program has examined cannabinoid measurements, sample preparation, analytical methods, moisture determination, and potential method bias as important considerations in cannabis laboratory testing.
Medical marijuana may become relevant when the disputed material or product was obtained, produced, tested, labeled, dispensed, purchased, or used in a medical-use context. Depending on the technical question and the applicable jurisdiction, records could include product information, certificates of analysis, batch documentation, dispensing or purchase records, and other evidence identifying the marijuana involved. Medical opinions or questions about a person's diagnosis, treatment, or clinical response should be addressed by an appropriately qualified medical professional rather than treated as part of general marijuana product expertise.
Batch identifiers, cultivation records, harvest and processing documentation, packaging, product labels, laboratory reports, photographs, inventory records, and chain-of-custody materials can help evaluate whether a tested sample or finished product corresponds to the marijuana at issue. A suitably qualified marijuana expert witness can compare those records for consistency and identify gaps or discrepancies that may affect conclusions about identity, composition, or handling.
Not by itself. A THC test may provide evidence relevant to cannabis exposure or use, depending on the specimen tested, the analyte measured, the timing of collection, and other circumstances, but the presence or concentration of THC alone does not establish an individual's degree of impairment. CDC notes that it is difficult to connect the presence or concentration of THC to driving impairment in an individual person, and NHTSA reports that there is little evidence of a direct dose-response relationship between blood THC concentration and driver impairment. When impairment, toxicology results, metabolism, or biological specimens are central to the dispute, specialized toxicology expertise may also be appropriate.
