From the 1940s up until the early 1970s, over ninety percent of all new pharmaceutical products were tested on prison inmates.

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This statement is true. From the 1940s to the early 1970s, prisons were used as a source of test subjects for new pharmaceutical products. It was only after several ethical and legal challenges that this practice was limited and eventually abolished.

From the 1940s Up Until the Early 1970s, Over Ninety