Distinctive patterned injuries caused by an expandable baton.

Identification and documentation of patterned blunt-force injuries at autopsy is of utmost forensic importance, particularly when the object or surface producing the injury is unknown or uncertain. Documentation of patterned injuries produced by known objects contributes to the catalogue of forensic knowledge regarding those objects and the injuries they cause. This report presents a case in which a 27-year-old male sustained multiple nonlethal patterned blunt-force injuries produced by an expandable baton and subsequent multiple gunshot wounds during apprehension by police.