By Elizabeth Chuck / NBC News
December 5, 2015

The weapons used in this week’s massacre in San Bernardino, California, were purchased legally, raising questions about how preventable gun violence is under current U.S. firearm laws.

Eighty-two percent of weapons involved in mass shootings over the last three decades have been bought legally, according to a database compiled by Mother Jones magazine that defines a mass shooting as taking the lives of at least four people in a public place. Using that criteria, Mother Jones found 73 mass shootings since 1982.

Authorities say Syed Rizwan Farook, 28, and his wife, Tashfeen Malik, 27 — the shooters who killed 14 people and injured 21 others this week. . .

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