Christiane looks at the disqualification of candidates from next month's presidential election in Iran.
In Japan, you cannot buy a handgun, much less an assault rifle. In fact, even off-duty police officers are banned from carrying guns.
You can buy a shotgun or an air rifle, but it is not easy:
No wonder Japan has one of the lowest gun ownership rates in the world.
But does it work?
In 2008, the U.S. had 12,000 gun-related murders. Japan had 11. More than double that number were killed in the massacre in Newtown, Connecticut.