New Study Shows NO Relationship Between CCW, Homicide or Violent Crime


New Study Shows no Relationship Between CCW, Homicide or Violent Crime
New Study Shows NO Relationship Between CCW, Homicide or Violent Crime

Arizona -( -A new study of violent crime and concealed carry law found no correlation between them.

The study compared homicide and violent crime at the state level with changes in concealed carry law over a 30 year period, from 1986 to 2015. During this period there were substantial changes in the laws regulating the carry of concealed weapons. From the study:


During the study period, all states moved to adopt some form of concealed-carry legislation, with a trend toward less restrictive legislation. After adjusting for state and year, there was no significant association between shifts from restrictive to nonrestrictive carry legislation on violent crime and public health indicators. Adjusting further for poverty and unemployment did not significantly influence the results.


This study demonstrated no statistically significant association between the liberalization of state level firearm carry legislation over the last 30 years and the rates of homicides or other violent crime. Policy efforts aimed at injury prevention and the reduction of firearm-related violence should likely investigate other targets for potential intervention.

The study was published in the Journal of the American College of Surgeons.

This study confirms what a number of other studies have found: Having more people without criminal records, carrying concealed firearms, does not increase violent crime.

The study examined the levels of homicide and violent crime when states moved from “no carry” to “may carry” to “shall issue” to “unrestricted carry.”

It is a significant finding to be published in a medical journal, as most papers I have read about the subject, in health-related journals, make apparent errors in data selection and the scope of the study.

This study avoids the errors of scope by looking at the data over all the states for a 30 year period.   It avoids selection bias by considering all homicides and violent crime, not just those involving guns.

This study only looks at detail down to the state level.  The studies were done by Dr. John Lott. Lott looks at data down to the county level, not just the states. Lott examines concealed carry by looking at the number of actual permits issued, not only when the law changed. That level of examination is likely to find subtle differences.

Only a small number of studies claim that homicides or violent crime go up as more people carry concealed weapons legally. They suffer from limited scope and/or data selection bias.

Dr. Lott has debunked studies that claim more guns equal more crimes.

This study differs from studies done by Dr. Lott. It attempts to examine the effect of  “unrestricted carry” also known as Constitutional Carry.  Dr. Lott’s methods have difficulty with measuring the impact of Constitutional Carry. There are no permit numbers to track with Constitutional Carry.

This paper will be used to counter the claims of studies of limited scope, which suffer from data selection bias.

Limiting data to only “gun deaths” or “gun violence” is a clear data selection bias if prevents any consideration of a weapons substitution effect or deterrence from self-defense cases.

Limiting the scope of research to only one state, or just a few years, allows researchers to pick a state or years that agree with their favored thesis.

Public health journals have generally been willing to publish poorly researched studies if it validates preconceptions that “guns are bad.”

Perhaps public health researchers will read this paper, and see the effect of biased data selection and limited scope in the other studies.

About Dean Weingarten:

Dean Weingarten has been a peace officer, a military officer, was on the University of Wisconsin Pistol Team for four years, and was first certified to teach firearms safety in 1973. He taught the Arizona concealed carry course for fifteen years until the goal of constitutional carry was attained. He has degrees in meteorology and mining engineering, and recently retired from the Department of Defense after a 30-year career in Army Research, Development, Testing, and Evaluation.

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Howard leith

I’ve had multiple firearms in the last 56 yrs in NY and in FL and have never committed an offense with those guns- nor have I ever been asked to participate in a survey concerning my firearms


Someone that lives in Missouri, can explain why the number of homicides spiked in this state? In period from 1998 to 2014, the number of homicides in Missouri remained stable. What happened after 2015, 2016 and 2017? Ferguson effect explains?


To fax everyone needs to remember nearly 1 and four American citizens have a criminal record and the most dangerous state in America with the state of Alaska last year for the second time having guns does not make you safer. *FYI All you have to do is look at the state of Texas where crime is now completely out of control

Dr. Strangelove

@ JAMES f BARRY: Work on your spelling, punctuation and grammar if you want people to take you seriously.


More than that in Congress have a criminal record esp the liberals. Where did you get your facts? Crime is out of control in Texas thanks to illegals.

ray rose

your full of bull.and you made your self out to be a moron…don’t like it get out of my country..

D Fullen

Mr. Barry, please don’t use CNN ‘statistics’ to make a point… it makes you look as ignorant and biased as they are. Do a little real research and you’ll find that California led the nation in murders in 2017 (with 1,830 killings – almost half of which {48%} were done with something other than firearms). A little more research will show you that violent crime in the U.S. has been on a downward trend for the last 18 years. And yews, it might require just a little more effort, but a little reading on your part will enlighten you to… Read more »


How can this be a “New Study” if it’s based on a three year old map that is no longer correct?


It’s based upon the data set and period reviewed by the study, not today’s laws. From the abstract “Study Design
Data on violent crime and homicide rates were collected from the US Department of Justice Uniform Crime Reporting Program (UCR) and the Centers for Disease Control and Prevention (CDC) over 30 years, from 1986 to 2015.” Likely the last full year for which updated data was available. Figure in when did they actually start the study, time to conduct the study, then peer review and published.


There is a LARGE difference. The states with unrestricted handgun carry policies (Constitutional Carry) have a much more effective and efficient early retirement programs for violent criminals. The rest of the country is still playing “catch and release”. That’s why, eventually, except for states like IL, HI, NY, CT, MA, NJ, MD, RI, WA and CA, to name a few, that are totally lost to the domestic communists, Constitutional Carry will continue to spread… because it works. -30-


Fun fact the state of Alaska last year was the most dangerous state in America and that’s the second year in a row states with gun reform and limitations on who and how many guns you have the lowest crime rate


Making a statement without citing sources is just so much hot air. Cite where you got the info from and what data backs it up.

The Revelator

He does it based on the per capita(100K) numbers in order to trick people. For Example, Anchorage AK had a population of just over 300K people in 2015. They had 1000 violent crimes per 100K, so that means 3000 violent crimes. Now look at Los Angeles CA, with a Population of 3.9 million. They had an average of 635 violent Crimes per 100K people. 635×39= 24,765 crimes. Now you and I know that the amount of crimes in Los Angeles is about 8 times that of Anchorage, but JAMES uses the per capita number to make it sound like less… Read more »


I’m confused. Who did this study?

“This study only looks at detail down to the state level. The studies were done by Dr. John Lott.”

“This study differs from studies done by Dr. Lott.”


I’m confused. So who did this study?

“This study only looks at detail down to the state level. The studies were done by Dr. John Lott. Lott looks at data down to the county level, not just the states.”

“This study differs from studies done by Dr. Lott. “


Your map is WRONG about Maryland. Maryland is a SO CALLED “may issue” state. However, it is nearly IMPOSSIBLE for a REGULAR LEGAL LAW ABIDING CITIZEN to obtain a carry permit.


It is, technically, still, a may issue State. The map is correct. You have to go by definition. It’s not fun, it’s not pleasant and I wish it were different but that’s what it is. Sort of like calling Larry Hogan a Republican Governor and pro-gun. (In name only)


Idaho is also listed wrongly, it is an unrestricted Constitutional Carry state.


Seems like good news, but it works both ways as well.

Green Mtn. Boy

On the map shown New Hampshire is shown as Shall Issue,it is however Unrestricted/Constitutional Carry.


Well duh, we gun owners all knew this to be true. The trick is to get the MSM to report it and refute the claims of politicians trying to pass stricter laws just to pander for votes.


The old saying…….Figures lie..lyres do figures.