People often confuse a toxicology report with toxicology report interpretation. A toxicology report is the laboratory document showing what substances were tested, what was found, and at what measured level in blood, urine, or another sample. Toxicology report interpretation is the next step: analyzing those results in context to estimate whether a substance was actually present, when it may have been used, whether the level is reliable, and whether it likely affected a person's behavior, judgment, or physical abilities.

That distinction matters because numbers on a lab page do not automatically prove impairment, fault, or cause of injury. Interpretation may involve metabolism, timing of collection, interactions between alcohol and drugs, prescription use, lab error, contamination, and whether the detected amount reflects active intoxication or only past exposure. In a crash case, those questions can change how lawyers, insurers, and juries view causation and comparative negligence.

In Mississippi, toxicology evidence can matter in both criminal and civil cases, including fatal wrecks investigated by law enforcement or the medical examiner. For alcohol, Mississippi's DUI law, Miss. Code Ann. § 63-11-30 (2024), uses a 0.08% blood alcohol concentration threshold for many drivers, but a toxicology interpretation may still be disputed even when a reported level appears straightforward. That can be especially significant in serious roadway collisions, including rural crashes where delayed testing affects reliability.