Michael Brown. Eric Garner. Walter Scott. Freddie Gray. The past year has been dominated by news of encounters between police officers and unarmed black citizens that have resulted in tragedy. Sandra Bland is the latest name on the list. She died in jail from what is reported to be a self-inflicted hanging, but the videotape of the traffic stop that led to her arrest has many questioning why the encounter, which began with an officer stopping Bland for failing to use her turn signal, ever resulted in her arrest.