A federal Court of Appeals judicial panel in 2015 said the failure to get a warrant could constitute a violation of Carlson's Fourth Amendment rights. The judges reversed an earlier ruling to dismiss the county from a lawsuit.
Police were called to Carlson's home in Karlin for a welfare check. Relatives told dispatchers he was suicidal and armed, and they feared he would provoke a shootout.
A standoff began that last 12 hours before a sharpshooter killed Carlson as he was pointing a rifle in the general direction of three deputies. He had been talking to the deputies in those moments.
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