Compact, space-saving, pre-fabricated evidence storage lockers from Safety Storage Inc. meet evidence storage and containment needs for police, fire, military, homeland security, coast guard, forensic laboratories and government agencies. The durable, weather-resistant outdoor Safety Storage units extend storage capacity for managing flammable and combustible chemicals and toxic and hazardous materials. The relocatable, detached, FM-approved structures meet industry safety standards and codes for detached outdoor installation. Features include an oversized, leak tight built-in containment sump to capture spills or leaks from damaged containers and vents for natural ventilation. A static ground connection, weatherproof steel construction and permanent hold-down anchoring plates provide added stability during adverse weather conditions. For greatest utility, ease-in-use and convenience, the evidence locker may be customized by selecting interior and/or exterior lighting, heating, air conditioning, mechanical ventilation, stainless steel shelving, explosion-relief panels, sump drain or overflow pipe, corrosion-resistant sump liners, alarm system, fire suppression system, removable fiberglass or galvanized steel floor grating, or other custom features.