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During two separate inspections over the past two years, the U.S. Food and Drug Administration found troubling laboratory procedures at the Chinese supplier of an ingredient used to make a widely used heart drug that was recalled because of a tainted substance linked to cancer.

The inspections — one of which was conducted in November 2016 and the other in May 2017 — found that Zhejiang Huahai Pharmaceutical failed to follow standard procedures for preventing contamination, ensuring product strength and purity, and investigating discrepancies in test results, some of which were actually fudged, according to inspection reports posted Thursday on the FDA web site.

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