CBRN Detection Systems?

Has anyone deployed such a system (chemical, biological, radiological, nuclear) and, if so, what are your experiences with it (what was it for, difficulty, manufacturers, etc.). Information was requested by one of our large retail/manufacturing customers. I am not sure what, at this stage, they want to detect, but I assume it could be in their worldwide retail stores or maybe related to their mail-order and package shipping operation.

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