Container with snap cover having frangible portions

A container assembly having a safeguard against undetectable unauthorized or partial opening after a cover is initially applied comprising a container adapted to receive material to be packaged and having an open end, a cover for said open end, said container and said cover having around their outer peripheries generally flat annular edge regions in coextensive adjacent relation, cooperating formations on the cover and container providing a reusuable snap fit connection between the cover and container permitting the cover to be reapplied with a snap fit after each removal from the container, and said safeguard being independent of said formations and comprising fastening means fixedly connecting said edge regions closely together after a container has initially been filled and the cover snapped thereupon over the opening, said fastening means being so constructed and arranged that upon rupture of fastening means for separation of said regions for partially or fully opening said container assembly a tear line pattern is formed at least in the cover edge region adjacent said ruptured fastening means, said tear line pattern being such that upon reclosure of the cover the cover and container edge regions cannot be undetectably reassembled in the initial cover closed condition.