Qualified immunity is the boon of government entities facing civil rights lawsuits under 42 USC § 1983. The hallmark of qualified immunity is that it "provides ample protection to all but the plainly incompetent or those who knowingly violate the law." It's designed to shield the government -- which usually ends up meaning "police officers" -- when government agents make honest mistakes about unsettled legal issues.
Now you can add this to the canon of acceptable police practice: Dropping off a questionably drunk man in the middle of the night in freezing weather and hoping everything goes swell.
Spoiler alert: The man died of hypothermia.
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