The assertion 'Category A substances can be transported by courier under the exclusive motor vehicle exemption' is:

• A. True
• B. Partly true
• C. Not applicable
• D. False

Answer: (D)

Category A infectious substances are among the most tightly regulated dangerous goods. The exclusive motor vehicle exemption exists only when a road vehicle is used exclusively for a single consignor’s dangerous goods and for a single transport run, so it can simplify handling in that specific scenario. But this exemption is not a blanket license that allows any infectious substance to be shipped by a courier. Category A substances must be packed in UN-approved packaging and handled by trained personnel under the applicable dangerous goods regulations, and shipments are typically routed through proper carrier channels (often air cargo with the correct packaging and documentation, or a road carrier under regulated ADR procedures). A general courier service, which handles multiple consignors and mixed shipments, does not meet the exclusive-use condition, nor does it provide the required packaging, labeling, and documentation standards for Category A. So the statement is not correct.