A new Nevada law that went into effect last month gives police officers the power to confiscate firearms from a person placed on a mental health crisis hold. Experts say it was designed to work in cases like the gunman who opened fire in a Manhattan office building on July 28, though it was not used in his case.

The New York City mass shooter had been diagnosed with multiple mental illnesses and had been the subject of two "mental health holds" in Las Vegas, but none of that limited his…

A new Nevada law that went into effect last month gives police officers the power to confiscate firearms from a person placed on a mental health crisis hold. Experts say it was…