Question Who must label hazardous materials? Answers The mechanic The shipper The driver Explanation The shipper of hazardous materials is responsible for packaging, marking, and labeling the materials properly. It is a good idea for the driver to ensure the materials are properly labeled. Take a FREE Practice Test Now This questions appears in the following tests: Iowa HazMat , Louisiana HazMat , New Mexico HazMat , South Dakota HazMat , Vermont HazMat , Idaho Tank ,