Case v. Montana · ¶5

a warrant if they have an “objectively reasonable basis for believing” that someone inside needs emergency assistance. The question presented is whether that standard means that officers must have “probable cause” for the intrusion, as they typically would when investigating a crime. We hold it does not. The probable-cause requirement is rooted in, and derives its meaning from, the criminal context, and we decline to transplant it to this different one. Brigham City's reasonableness standard means just what it says, with no further gloss. And here it was satisfied because the police had “an objectively reasonable basis for believing” that a homeowner intended to take his own life and, indeed, may already have shot himself.

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