Mug book

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A mug book is a collection of photographs of criminals, typically in mug shots taken at the time of an arrest. A mug book is used by an eyewitness to a crime, with the assistance of law enforcement, in an effort to identify the perpetrator.[1][2] Research has shown that grouped photos result in less false-positives than individually displaying each photo.[3]

Mug book also has a meaning in genealogy and history, referring to local biographical histories published in the US in the late 19th century.[4][5][6]

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