I think I would have to agree that CCW probably wouldn't affect the suicide rate significantly. Maybe a few more people would do it but perhaps not statistically significant. I do believe there was a study that showed if a firearm was present that people had higher rates of suicide however CCW might not not affect it since anyone who CCW is by default already owning a gun.
Ok, here is a link summarizing a number of studies on the subject. It appears consistent that suicide rates are higher in states with higher rates of gun ownership. One study did show that gun owners weren't more suicidal than non gun owners but equal which would suggest that the availability of the gun plays a big role and its not that us gun owners are just more crazy or depressed or poor etc etc.
http://www.hsph.harvard.edu/hicrc/firearms-research/gun-ownership-and-use/
This does make sense for two main reasons that I can think of right now.
First is that a firearm ends up being a more effective form of suicide wherase many other people who attempt can be saved with timely intervention. Someone taking pills might survive by having their stomachs pumped for example.
The second is that having a firearm present translates into the means being readily available so someone has less time to change their mind. Going and finding a tall building to jump off of requires more time and effort where someone might change there mind or be stopped for example.
I guess a third might be that a firearm is easier in the sense that it is over very quickly and probably painlessly. Cutting oneself, I believe, is harder to do since you will be feeling the pain.
As for the officer drinking when he shot himself accidentally I had heard that from someone who knew him. I haven't seen an independant verification of just how much he did have to drink. I could imagine a specific alcohol level become part of the law but that would make it more complicated since the law would then need something to compell a person to submit a sample as does the DUI law. Maybe 0.05% would be fair since that is the rate you can be arrested for DUI if you ended up in an accident. I think for comercial license holders their license requires they not blow above 0.02%
First, Harvard's Injury Control Research Center and one of the authors, Hemenway is notoriously anti-gun, so anything they publish is suspect. Second, the conclusions were:
We performed reviews of the academic literature on the effects of gun availability on suicide rates. The preponderance of current evidence indicates that gun availability is a risk factor for youth suicide in the United States. The evidence that gun availability increases the suicide rates of adults is credible, but is currently less compelling. Most of the disaggregate findings of particular studies (e.g. handguns are more of a risk factor than long guns, guns stored unlocked pose a greater risk than guns stored locked) are suggestive but not yet well established.
So this study said the current evidence is more than 50% (preponderance) that gun availability is a risk factor. But how much risk? It then makes a subjective assessment about the rate of suicide being affected by gun ownership ("...credible but is currently less compelling") and ends with another subjective assessment that the most of the studies used in this review were "...suggestive but not yet well established." Note the "...not yet well established..." statement. If one were objective, they would say something like it wasn't established, or the evidence didn't support the contention, but these guys already know that the findings will, at some point, substantiate their preconceived ideas. Hence the "...not yet..."
Another study studying the correlation between guns and suicide found:
The study confirms that people with guns at home are no more likely to attempt to kill themselves - but they are more likely to succeed because they are more likely to use a gun, Dr. Eric Fleegler, a pediatric emergency medicine doctor at Boston Children's Hospital and instructor at Harvard Medical School, said.
American Journal of Epidemiology, online August 23, 2013.
So, are you more likely to be successful if you attempt to commit suicide with a gun versus other methods? Yes. Will the presence of a gun increase the chances that you will attempt to commit suicide? Debatable, but probably not.
Some more good info here:
http://reason.com/blog/2013/02/14/does-gun-ownership-promote-suicideAnother frequently cited example: Japan, with a gun ownership rate of 0.6 per 100 people, compared to 88.8 in the United States, has a suicide rate nearly twice as high as high. China and South Korea likewise have much lower rates of civilian gun ownership but much higher rates of suicide. The relationship between gun ownership and suicide clearly is neither consistent nor straightforward.
As the article above points out, the rate of suicide in countries that have lots of guns is sometimes less than that of other countries without guns. That being the case, conclusive evidence of correlation is severely lacking. Furthermore, as the Reason article points out, the medical literature on guns is all too frequently biased by the researchers preconceived notions. As Rosenberg (and then Holder) said: "We need to revolutionize the way we look at guns, like what we did with cigarettes. It used to be that smoking was a glamour symbol—cool, sexy, macho. Now it is dirty, deadly—and banned."
No obvious bias there.....