1. A container screening system for detecting hazardous materials in a container, comprising: a universal product code (UPC) reader that reads a UPC barcode from said container; a first sensor that detects materials inside said container using a first detection technology; a second sensor that detects materials insider said container using a second detection technology, wherein said second detection technology is different from said first detection technology; and a data processing unit that processes data from said first sensor and said second sensor, and identifies a material inside said container, wherein said UPC reader is used as a queuing device for the first and second sensor.