Red Flag laws Are Designed to Remove Guns from the Hands of People Indicating Unstable Behavior
According to Wikipedia, "In the United States, a Red Flag law is a gun control law that permits police or family members to petition a state court to order the temporary removal of firearms from a person who may present a danger to others or themselves. A judge makes the determination to issue the order based on statements and actions made by the gun owner in question."
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I looked at the sources on the Wikipedia page and they are thorough