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Recent high profile cases of unarmed black men dying at the hands of the US police have sparked outrage, protests and civil unrest in several American cities. The deaths of Michael Brown, Eric Garner, Walter Scott and Freddie Gray are \u2013 some claim \u2013 evidence of long-standing problems with police racism and excessive violence. But what do we really know about what\u2019s happening? Our expert witnesses this week explain the issues of racism, bias and police use of force. And the head of President Obama\u2019s taskforce on police reform, Charles Ramsey, tells us that fixing the problem will involve much more than just fixing the police.

(Photo: Demonstration in St Louis, Missouri, following the shooting of Michael Brown. Credit: Scott Olson/Getty Images)