Which of the following is considered an indicator of a suspicious package due to staining?

• A. Oily stains
• B. Unusually bulky or rigid
• C. Restrictive markings
• D. Misspelled words

Answer: (A)

Oily stains on a package are a direct sign that contents may be leaking or seeping, which points to the presence of a liquid hazardous material such as solvents or oils. This kind of staining raises the level of concern about potential flammability, toxicity, or reactivity, making it the strongest indicator among the options for a suspicious package related to staining. The other signs—unusually bulky or rigid packaging, restrictive markings, or misspelled words—don’t by themselves indicate hazardous leakage or contamination. So oily stains most clearly flag a potential hazard and warrant caution and escalation to proper authorities.