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Publication 52 - Hazardous, Restricted, and Perishable Mail >
2 General Guidelines > 24 Emergency Procedures > 242 Hazard Duration
Frequently, the effects of exposure resulting from damage, spillage, or leakage of harmful matter are not obvious or readily apparent. For example, infectious substances, radioactive material, corrosives, and poisons can cause illness or injury that may become known to the victim gradually and long after the incident.