Which of the following is an example under Protocol 108?

• A. Explosion
• B. Bomb Threat
• C. CBRN Threat
• D. Letter With Suspicious Residue

Answer: (D)

Protocol 108 deals with handling suspicious items found in the mail and any residues on those items, focusing on the step-by-step response to potential mail-borne hazards. A letter with suspicious residue fits this scope because it is a tangible item that could carry a contaminant and thus triggers mail-related protocols and precautionary actions. This is different from an event like an explosion or a general threat category like a bomb threat or a broad CBRN threat, which fall under other protocols or response pathways. So a letter with suspicious residue is the example that best matches Protocol 108.