Explosives Trace Detection and Alarm Resolution Flashcards

What is the main purpose of explosives trace detection (ETD) at a checkpoint?

Answer: To detect microscopic traces of explosive residue on a person or item

ETD samples surfaces for minute particles or vapors of explosive material. It adds a layer of screening beyond imaging and metal detection.

Why do officers change gloves between samplings or pat-downs?

Answer: To prevent cross-contamination that could cause false alarms or hide real traces

Trace particles transfer easily. Changing gloves prevents residue from passing from one passenger or item to another and keeps results accurate.

A bag alarms during screening and the cause is not yet determined. What should the officer do?

Answer: Resolve the alarm through additional screening per standard procedure before the bag is cleared

An alarm must be resolved, not assumed harmless. Officers follow standard operating procedures with additional screening, and escalate to a supervisor if it cannot be resolved.

An alarm cannot be resolved using standard procedures. What is the correct next step?

Answer: Notify a supervisor and follow escalation procedures

Alarms that remain unresolved must be escalated to a supervisor or the designated authority under established procedures. They may not be cleared by guesswork.

Why is it important to follow the same sampling procedure every time with trace detection equipment?

Answer: Consistent procedure produces reliable, comparable results

Consistent sampling gives reliable results and reduces human error, which matters in a security setting.

During bag inspection an officer finds an item that appears suspicious. What is the most appropriate action?

Answer: Stop handling it, keep others back, and notify a supervisor per procedure

An item that may be dangerous should not be handled roughly or tested casually. Stopping, keeping others away, and notifying a supervisor follows the established safety procedures.