A Globe investigation has found that time after time, hospitals ignored the long-term danger posed by David M. Kwiatkowski, a radiology technician, allowing him to move from state to state, endangering the lives of patients as he adopted more elaborate methods of stealing drugs. When he was finally arrested this summer, prosecutors say, Kwiatkowski had committed one of the most egregious medical crimes in US history, infecting at least 39 patients with a life-threatening virus often spread by tainted needles.
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