The present invention is a transportable portal for screening a target, whichmaybe a person, standing or placed inside the portal. It employs two walls withairducts in the walls, usually two ducts per wall running from the bottom to thetop ofeach wall, and having a number of air intakes spaced along the height of thewall. A blower module blows air downward on the target to dislodge particlesandvapor, which are drawn in the air ducts and analyzed by a detection module.Each detection module may have a pre-concentrator with a nano-platinumsurface for collecting and pyrolyzing samples, and chemical, optical andradiationdetectors for detecting illicit materials. The portal may be disassembled orreassembled by two people using hand tools in less than one hour and thenplaced in a space of less than one cubic metre for transport.
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