Why ghost guns are America's fastest-growing gun problem

Ghost guns are coming under fire from gun-control advocates. But why are these weapons so difficult to trace? And can anything be done to keep them from getting into the wrong hands?

Manuel Yambo had never heard of a "ghost" gun until his 16-year-old daughter was killed by one.

He was at home, getting ready for work, when he got a call that every parent dreads. 

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https://www.bbc.com/news/world-us-canada-65170507