The person who shot that famous video was 17-year-old Minneapolis resident Darnella Frazier. Her footage, along with other angles captured by other witnesses on that day in late May, galvanised a social media wave and prompted protests around the world.

But are viral videos really an effective check on police abuse? We talk to the experts, look at the evidence – and talk to witnesses and people on the front lines of the protests.

Presenter: Michael Wendling

Reporter: Reha Kansara

Picture caption: A protest sign reading “No justice, no peace”

Picture credit: Getty Images