Martain v The King

The appeal concerned a sentence imposed on the appellant for culpable driving causing death in South Australia. The appellant argued that the sentencing judge erred in assessing the objective seriousness of the offence by failing to give proper regard to his undiagnosed sleep disorder. He contended that this disorder was a material cause of the collision, outside of his control, and therefore reduced his moral culpability.

The legal issue before the court was whether the sentencing judge had adequately considered the impact of the appellant's undiagnosed sleep disorder on the objective seriousness of the offence and his moral culpability. The appellant relied on the principles established in *Spanjol v The Queen*, which allows for a qualification of the proposition that the offender was solely responsible for their driving and that their driving was the sole cause of the resulting injury. Specifically, the appellant argued that an external circumstance, his sleep disorder, was a material cause of the collision, thereby reducing his culpability.

The court considered the principles from *Spanjol v The Queen*, which distinguish between "reduced responsibility" for the manner of driving and "other contributing causes" to the injury. In *Spanjol*, the Victorian Court of Appeal held that a sentencing court may consider if another person or an external circumstance was partly responsible for the manner of driving, or if an additional factor outside the offender's control was a material cause of the injury. The court noted that the language of "complicity" should be avoided, and instead, "reduced responsibility" or "other contributing causes" should be used. The appellant's submission was that his undiagnosed sleep disorder constituted such an external circumstance that was a material cause of the collision, thereby reducing his moral culpability.