Final answer:
Solid medical waste is not always hazardous, unlike chemical, radioactive, or infectious waste, which are typically hazardous due to their properties or potential to cause harm.
Step-by-step explanation:
The type of medical waste that is not always hazardous is solid waste. Solid medical waste, unlike chemical, radioactive, or infectious waste, can include non-hazardous items such as paper towels, cotton balls, or items not contaminated with bodily fluids.
Chemical waste includes solvents and reagents that are typically hazardous due to their corrosive or toxic properties. Radioactive waste comes from nuclear medicine and is always considered hazardous due to its radiation. Infectious waste, which contains pathogens, is also considered hazardous due to its potential to cause disease.