What is the role of post-crash testing and toxicology in investigations?

• A. They are optional and rarely used.
• B. They determine the sole cause.
• C. They only test for illegal substances.
• D. They help determine impairment, safety risks, and contributing factors to the mishap.

Answer: (D)

Post-crash testing and toxicology are used to determine whether impairment affected performance and to identify safety risks and contributing factors in the mishap. Toxicology checks for a range of substances that can impair alertness, judgment, reaction time, or coordination, including alcohol, illegal drugs, and prescribed or over-the-counter medications. The results provide objective information that, when integrated with flight data, cockpit communications, witness statements, and the crash scene, helps investigators assess if impairment played a role and what safety risks were present at the time.

This information doesn’t point to a single sole cause, since most aviation mishaps involve multiple interacting factors. Even when impairment is identified, investigators evaluate its timing, relevance to the flight, and whether it contributed to the sequence of events rather than being the sole cause. The aim is to understand how impairment or substances may have increased risk and to recommend preventive measures for the future.

Post-crash testing is a standard part of a thorough investigation, and its scope includes substances that can affect performance, not just illegal ones.