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Glendale, UNITED STATES: A man chooses a gun at the Gun Gallery in Glendale, California, 18 April 2007. The massacre at Virginia Tech has ignited fresh talk in the Democratic-led US Congress about tightening US gun laws but it is doubtful enough lawmakers will tackle the politically charged issue. With so many citizens in love with their guns and defensive of their right under the Constitution to keep and bear arms, politicians are reluctant to take on gun owners or the powerful gun lobby.    AFP PHOTO/GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
Glendale, UNITED STATES: A man chooses a gun at the Gun Gallery in Glendale, California, 18 April 2007. The massacre at Virginia Tech has ignited fresh talk in the Democratic-led US Congress about tightening US gun laws but it is doubtful enough lawmakers will tackle the politically charged issue. With so many citizens in love with their guns and defensive of their right under the Constitution to keep and bear arms, politicians are reluctant to take on gun owners or the powerful gun lobby.    AFP PHOTO/GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)

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What stops the mentally ill from buying guns?

How does the law define who has a history of mental illness and when they can be stopped from buying a firearm? CNN legal analyst Danny Cevallos explains.

What stops the mentally ill from buying guns?

How does the law define who has a history of mental illness and when they can be stopped from buying a firearm? CNN legal analyst Danny Cevallos explains.