President Bill Clinton used his presidential pardon power in July 2000 to commute the sentence of Serena Nunn, who was sentenced to 15 years for a first-time nonviolent drug offense when she was 19.
As a candidate for president in 2008, Barack Obama pledged to "immediately" review federal mandatory minimum sentences "to see where we can be smarter on crime and reduce the ineffective warehousing of nonviolent drug offenders."
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