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The Paraquat poisoning problem

JON HEYLINGS WAS 34 when he found the notebook that would upend his life. A junior scientist at Imperial Chemical Industries, Heylings happened upon it in 1990 as he was trying to solve a mystery. Trained in toxicology, he had been brought to the company three years earlier to lead a team that would work to reduce the health risks of ICI products that contained the pesticide paraquat. He had spent much of that time testing formulations that did appear to be safer. Yet to Heylings’s puzzlement, the company hadn’t put them on the market. Curious about how ICI had arrived at the chemical concentrations in the version of the pesticide it was selling, he did some research in the corporate archives. There he came across the old book of notes that Michael Rose, a senior scientist at the company, had handwritten years earlier.

Heylings knew Rose and had seen his findings, which were known within the company as the Rose Report. ICI had used the report to justify the concentration at which it added a chemical called PP796 to its paraquat products. But the numbers and graphs he saw jotted in the notebook didn’t support the conclusion that Rose drew in his official report. “When I compared the data in his report to the original pharmaceuticals clinical trial data, I found they were different,” Heylings told The Intercept. “You know, very different.” While an accurate analysis would consider all the outcomes in an experiment, Rose had “cherry-picked,” according to Heylings. “He took some data out, he put some data in.”…..