The Non-Medical Job Workers That Use Special Precautions Just because someone is dressed like a surgeon, doesn’t mean they practice medicine. Mark Russo is a plumber who owns his own business in New Jersey. When he goes to work, he’s taking extra precautions for himself and his clients. Not only does Mark wear the same type of personal protective equipment that we’re used to seeing on medical professionals, but he pre-screens every job he takes. When a homeowner calls for service, Russo asks some probing questions about the family’s health.