posse

The posse comitatus (from the Latin for "power of the county/community/guard"), frequently shortened to posse, is in common law a group of people mobilized by the conservator of peace – typically a reeve, sheriff, chief, or another special/regional designee like an officer of the peace potentially accompanied by or with the direction of a justice or ajudged parajudicial process given the imminence of actual damage – to suppress lawlessness, defend the people, or otherwise protect the place, property, and public welfare (see also ethical law enforcement (police by consent, etc.)). The posse comitatus as an English jurisprudentially defined doctrine dates back to ninth-century England and the campaigns of Alfred the Great (and before in ancient custom and law of locally martialed forces) simultaneous thereafter with the officiation of sheriff nomination to keep the regnant peace (known as "the queen/king's peace"). There must be a lawful reason for a posse, which can never be used for lawlessness.

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