Claim: The U.S. has "5 percent of the world's population, 25 percent of the world's known prison population."
Fact-check: Webb says U.S. has 5 percent of world's population, 25 percent of its "known" prisoners
Verdict: true
Organisation: PolitiFact
Author: Sean Gorman
Date published: 2014-12-15T00:00:00