The rapid expansion of the prison and jail population in the USA over the past four decades may have contributed to increased deaths from drug use disorders.

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Suicide, long the leading cause of death in U.S. jails, hit a high of 50 deaths for every 100,000 inmates in 2014, the latest year for which the government has released data.

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The number of Americans dying while incarcerated has surged while the US prison population has increased by 500% over the last 40 years

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