Mohamedou Ould Slahi - Former Guantanamo detainee and author

Stephen Sackur interviews Mohamedou Ould Slahi, a Mauritanian citizen who was once identified as a high value Al-Qaeda terrorist, serving 14 years in America's Guantanamo Bay prison. He was eventually released without charge, and now a film, The Mauritanian, has been released telling this remarkable story. What is the Guantanamo Bay legacy?