The PBS public affairs program's investigation into the battle over gun rights after the shooting found that within three months of the massacre, states across the country were considering more than 1,000 pieces of legislation. About half aimed to expand gun rights, while the other half aimed to restrict them. But at the end of 2013, only 43 gun-control laws have been passed, and nearly a quarter of those were passed in California.
Frontline also identified a possible reason for the discrepancy: gun-rights groups outspent gun-control groups by nearly $10 million in their efforts.
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