Tough sentencing laws, record numbers of drug offenders and high crime rates have contributed to the United States having the largest prison population and the highest rate of incarceration in the world, according to criminal justice experts.
A U.S. Justice Department report released on November 30 showed that a record 7 million people -- or one in every 32 American adults -- were behind bars, on probation or on parole at the end of last year. Of the total, 2.2 million were in prison or jail.
According to the International Center for Prison Studies at King's College in London, more people are behind bars in the United States than in any other country. China ranks second with 1.5 million prisoners, followed by Russia with 870,000.
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