A U.S. Senate investigation has uncovered dozens of credible reports of medical neglect and poor conditions in immigration detention centers nationwide — with detainees denied insulin, left without medical attention for days and forced to compete for clean water — raising scrutiny about how the government oversees its vast detention system.

The report released by Sen. Jon Ossoff, a Democrat from Georgia, is the second in a series of inquiries examining alleged human rights abuses in the immigration detention system. It builds on an August review that detailed mistreatment of children and pregnant women and draws from more than 500 reports of abuse and neglect collected between January and August.

The latest findings document more than 80 credible cases of medical neglect and widespread c

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