Texas Lt. Gov. Dan Patrick claims states where people carry guns have less crime

"Everywhere that we have more citizens carrying guns, crime is less. There's a study showing that where states have open carry or concealed carry, but particularly open carry, the crime is down 25 percent."
http://www.politifact.com/truth-o-meter/statements/2016/jan/03/dan-patrick/texas-lt-gov-dan-patrick-claims-states-where-peopl/