EXCLUSIVE: Firefighter investigated after hitting motorcyclist
Quinn drove a fire truck through a red light and hit motorcyclist Jack Frazier.
Prosecutors could not prove DUI after a judge threw out blood evidence.
RELATED: Charges dropped against SF firefighter who hit motorcyclist
Quinn was seen chugging water on surveillance video at the bar right next to the crash scene, and he left before police could question him. Investigators met him hours later back at the fire station.
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