What is the fine-grained topic of the following text: In 1970 the proportion of Americans behind bars was below one in 400, compared with today’s one in 100... Jim Felman, a defence lawyer in Tampa, Florida, says America is conducting "an experiment in imprisoning first-time non-violent offenders for periods of time previously reserved only for those who had killed someone"... Only return the topic.
Incarceration rates and policies in America