Joining Senate Judiciary Committee Chairman Patrick Leahy, D-Vt., Senator Rand Paul, R-Ky., has introduced a bill to allow judges greater flexibility in sentencing federal crimes where a mandatory minimum punishment is considered unnecessary.The bipartisan Justice Safety Valve Act of 2013 will expand the so-called "safety valve", which allows judges to impose a sentence below the mandatory minimum in qualifying drug cases. Leahy and Paul are polar opposites politically, but the two senators agree more latitude is needed to address the country's growing prison population and spiraling costs. For many critics, the "tough-on-crime" of the past 30 years have created laws that disproportionately effect minorities and the poor.Paul emphasizes that the mandatory laws are a part of federal overreach where more judicial discretion is needed."Our country’s mandatory minimum laws reflect a Washington-knows-best, one-size-fits-all approach, which undermines the Constitutional Separation of Powers, violates the our bedrock principle that people should be treated as individuals, and costs the taxpayers money without making them any safer," Paul said in a news release. "This bill is necessary to combat the explosion of new federal criminal laws, many of which carry new mandatory minimum penalties."According to the Congressional Research Service, federal prisoners skyrocketed by nearly 790 percent from 25,000 inmates in 1980 to 219,000 in 2012.From Think Progress: