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Washington (CNN) - The Justice Department will no longer pursue mandatory minimum sentences for certain low-level, nonviolent drug offenders, Attorney General Eric Holder said Monday, noting the nation is "coldly efficient in jailing criminals," but that it "cannot prosecute or incarcerate" its way to becoming safer.

"Too many Americans go to too many prisons for far too long, and for no truly good law enforcement reason," Holder told the American Bar Association's House of Delegates in San Francisco.