How can building collapses in Nigeria be prevented?

Early findings into why a school building in Nigeria's Plateau state collapsed killing more than 20 children, have revealed many shortcomings. But the tragedy was one of more than 20 reported cases in the past few months. How can rules and regulations be tightened to prevent building collapses?Sierra Leone is considering dropping jury trials. What are the arguments for and against the proposed change to the justice system?And we meet Cindy Ngamba, one of the first people to compete for an Olympic medal in boxing as part of the refugee team. How did she become interested in the sport?Presenter: Audrey Brown Producers: Nyasha Michelle, Sunita Nahar, Victor Sylver and Claudia Efemini in London. Blessing Aderogba in Lagos. Technical Producer: Ricardo McCarthy Senior Producer: Patricia Whitehorne Editors: Andre Lombard and Alice Muthengi.