Abstract: Apparatus and methodology utilizing nearfield microwave technology to detect contraband/forbidden substances concealed within metallic containers. Apparatus and methodologic microwave operating frequency determines the metallic thickness through which detection is possible, and also the expectable “depths” for detection within a metallic container. Special and important attention is paid to the appropriate positional and distance locating of the invention apparatus relative to a suspected “substance-containing” metallic container for detection to be most effective. Preferably, this distance is substantially equal to the closest distance from the central radiating plane of a lens/antenna (which is employed, according to a preferred practice of the invention) at which a conductive, metallic surface will regeneratively parasitize the lens/antenna.