A shield assembly for enclosing and restricting access to the port of a container including a tamper evident structure. A housing includes two segments movable between closed and opened orientations. A hollow interior of the housing, when in the closed orientation, substantially corresponds to the enclosed port. A lock assembly includes male and female members wherein a frangible structure interconnects the female member in engaging relation to the male member in a locked orientation. Passage of the male member through the female member from the locked position into an unlocked position results in detachment of the frangible structure and an enlargement of the female member sufficient to restrict the lock assembly from assuming the locked position. A tracking assembly is included and operative to identify and distinguish a plurality of shield assemblies and/or their components from one another.
