Who performs definitive identification?

• A. Scientific experts in a nationally recognized laboratory
• B. Field technicians from the incident site
• C. Chain of command officers
• D. Lab assistants

Answer: (A)

Definitive identification means conclusively determining exactly what a substance is, using validated analytical methods in controlled, accredited conditions. This level of certainty comes from skilled scientists working in a nationally recognized laboratory who apply confirmatory tests with proper quality controls and verification. Field personnel can collect samples and run screening tests that point toward a possible identity, but those results aren’t considered definitive on their own. Officers may decide on actions based on available information, and assistants can support testing, but the precise, legally reliable identification is performed by qualified experts in an accredited lab.