From Politifact Florida:
We interviewed John R. Lott, president of the Crime Prevention Research Center which compiles data on gun permits in states. Lott, an academic and Fox News columnist, published the book More Guns, Less Crime through the University of Chicago in 2010.
He said there are four factors that influence the number of gun permits in a state: the amount of fees, hours of required training, how many places people can or can’t carry their firearms and how many years the rules have been in effect. For example, Pennsylvania has one of the lower fees, while Florida has higher fees but close to average in terms of training requirements. . . .