He also has a link to an interesting study comparing two large states, one with mandatory background checks, the other without.
The Effect of Gun Shows on Gun-Related Deaths: Evidence from California and Texas
Clayton says one of the authors of the study favors gun control.
The study compares California (requires background check and 10-day waiting period for all firearms sales) with Texas (no background check for private sales, no waiting period, ZOMG!) from 1994-2004 and looks for changes in the homicide and suicide rates around the time of gun shows, in zip codes containing or close to gun shows. During the the study period California and Texas accounted for about 20% of the US population and over 3300 gun shows.
Some highlights:
From the abstract:
We find no evidence that gun shows lead to substantial increases in either gun homicides or suicides. In addition, tighter regulation of gun shows does not appear to reduce the number of firearms-related deaths.
In California:
For example, our findings indicate that in the average year from 1994 to 2004, there are four additional gun suicides in the entire state of California resulting from the 102 gun shows occurring in the average year. Moreover, this increase is offset entirely by an almost identical decline in the number of non-gun suicides, suggesting that gun shows influence the
method but not the number of suicides. We find no evidence to suggest that gun shows increased the number of homicides in California during our study period.
And in Texas:
According to the study, Texas had nearly twice as many gun shows as California.But our results provide little evidence of a gun show-induced increase in mortality in Texas. In fact, we find that in the two weeks following a gun show, the average number of gun
homicides declines in the area surrounding the gun show. Aggregating across all gun shows in the state, we find that there are approximately 16 fewer gun homicides resulting from the 200 gun shows in the average year.
California needs to end killer background checks now! And hold more gun shows.