That's EXACTLY what they did in California and Canada, required background check for every firearm sales, including between non-licensed individuals. The result? No impact whatsoever. Not surprising when you consider firearms used in crime are obtained either through the black market or obtained from friends or family members.
In 2009 and 2010, the most recent years for which information is available, California had the nation's strongest gun controls and the ninth-lowest rate of gun deaths, according to the Law Center to Prevent Gun Violence, which favors firearms regulation.
Connecticut had the fourth-strongest gun laws and was sixth-lowest in gun deaths, while Hawaii ranked fifth in gun control and had the lowest death rate.
At the other end of the scale, the report found that Alaska, Louisiana and Montana - all graded F for gun control - had the highest rates of deaths caused by gunfire, more than double California's rate. The law center graded all 50 states and gave an F, for weak regulation, to 24 of them.
Read more: Tough gun laws linked to fewer deaths - SFGate