That this might be a tort case, an involuntary manslaughter case, a negligence case in which someone died as a result of an automobile accident case.

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In a drowsy driving case late last year, a tour bus driver was acquitted of manslaughter and negligent homicide in a 2011 Bronx crash that killed 15 people.

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In 2009, a manslaughter case against a friend of the teenager collapsed when a judge ruled there was insufficient evidence.

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The case of unemployed Mick Philpott, jailed last week for the manslaughter of six of his children in a fire, has led some politicians to comment on whether the state should subsidise large families.

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He had been charged with manslaughter because it was a "clear case" of gross negligence.

BBC: Meg Burgess

Though, in one recent case, a court threw out the black box evidence used against a California man to convict him of vehicular manslaughter because the police pulled the data from the black box of his SUV without getting a warrant first.

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Mr Osborne, of the Kent and Essex Serious Crime Directorate, said the case was investigated with a view to bringing a manslaughter charge against the nurse and a corporate manslaughter charge against the hospital, but concluded that the death was a terrible mistake.

BBC: Norman Betchley