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Chassin gets it exactly backward. In 2011, a doctor in Oregon performed surgery to correct a 4-year-old boy’s wandering right eye, but the surgeon erroneously operated on the child’s left eye. Before this surgery, the correct operative site had been marked in accordance with the Universal Protocol, but when a nurse prepped the wrong eye for surgery, the surgical drapes covered the marking — the very problem that Chassin thinks will affect negative labeling. But if a negative label had been placed on the boy’s left eye, then that warning would have been exposed when the nurse prepped the wrong eye. If the negative label were obscured by surgical drapes, that would mean the correct side had been prepped.