The number of Americans asserting their right to carry concealed guns has exploded – from less than a million a few decades ago to as many as 11 million now. There's evidence that gun prevalence can deter crime, but preventable tragedies perturb.
Why Americans now carry handguns in so many public places, from parks to college campuses. Is it making the country safer or more dangerous?
Allegations that the Bureau of Alcohol, Tobacco, Firearms and Explosives allowed US arms to flow to Mexican cartels are now facing congressional scrutiny, including questions about whether that may have contributed to the deaths of a US law enforcement officer and numerous Mexicans.
A new report shows that 70 percent of confiscated weapons submitted for tracing come from the US, but critics say the figure is politically motivated.