John Lott’s Crime Prevention Research Center has released a report related to concealed carry permit holders. I haven’t read the entire report yet, but a few highlights. Currently 11 million individuals hold permits. However, the number is actually higher since some states do not require permits to carry or report the numbers. Secondly in the time frame 2007 - 2013 the violent crime rate dropped by 22 percent while the number of permits increased by 130 percent. Obviously there are other factors that may have played into the drop in crime, but more guns did not result in “blood in the streets” as some have predicted.
http://crimepreventionresearchcenter.org/wp-content/uploads/2014/07/Concealed-Carry-Permit-Holders-Across-the-United-States.pdf
http://crimepreventionresearchcenter.org/wp-content/uploads/2014/07/Concealed-Carry-Permit-Holders-Across-the-United-States.pdf