It's more like they want to know who served him alcohol last.
Culpability generally implies that an act performed is wrong but does not involve any evil intent by the wrongdoer. The connotation of the term is fault rather than malice or a guilty purpose. It has limited significance in criminal law except in cases of reckless homicide in which a person acts negligently or demonstrates a reckless disregard for life, which results in another person's death.
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