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Callanan grinds a bit more of the counterfeit pill with a mortar and pestle, and tests it with X-ray diffraction to confirm the first set of results. Here, Callanan further refines the fake’s formula by comparing it to Pfizer’s library of excipients—the inert ingredients that give a drug its form and consistency. “You see these other red mystery peaks,” she says, pointing at the screen. “Those are calcium sulfate diehydrate and calcium sulfate hemihydrate, the two most common ingredients we see in counterfeits.” Noticing my blank expression, she adds, “It’s gypsum, the same stuff as sheetrock.”
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