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America's addiction to mass incarceration could almost double its number of deaths from coronavirus, with jails acting as incubators of the disease and spreading a further 100,000 fatalities across the US.

The startling warning comes from groundbreaking modeling by the American Civil Liberties Union (ACLU) and academic researchers, released on Wednesday.

Related: Mass incarceration could add 100,000 deaths to US coronavirus toll, study finds