Department of Transportation Guidance for Transporting Ebola Contaminated Items, a Category A Infectious Substance An infectious substance is regulated as a hazardous material under the U.S. Department of Transportation’s (DOT’s) Hazardous Materials Regulations (HMR; 49 C.F.R., Parts 171-180). The HMR apply to any material DOT determines is capable of posing an unreasonable risk to health, […]