I like Entry No. 14 for two reasons: (1) the picture somewhat conveys the idea behind the technology (perhaps a cargo container being scanned by two opposing "screens"; or maybe being encircled by electrons, etc.); (2) the checkmark in the A is a TERRIFIC idea! That really brings in the other focus of the technology, which is that it cannot only detect dangerous or contraband substances, but can also check shipping manifests for accuracy, increasing a country's import/export duties, etc. The only thing I guess I don't like is the tagline below the logo.... We don't really have one, and I just came up with that on the fly. In retrospect, I don't love it. Also, it might be nice if it were a bit smaller, or if there were another option with the logo to the side of the wordmark but scaled down some. By the way, I LOVE your work! Great stuff!