Most adults’ exposure to lead isn’t enough to endanger their health. But, thousands of people work in close contact with dangerous lead fumes and dust; sometimes without even knowing it. State and federal rules require employers to protect their workers from toxic materials, still, some industries continue to operate with little or no safety precautions against lead poisoning. In part three of our series, Deirdre Kennedy has the story of one man who fell victim to the Silent Epidemic.