15:50More or LessViolence, shootings and the police in the USBBC World Service Duration: 9 minutes Mon 18th Jul 2016, 15:50 on BBC World Service West and Central AfricaAvailable for over a yearListen nowTim Harford investigates the numbers surrounding police shootings in the USA. Show more GenresFactualFormatsMagazines & ReviewsBrandMore or Less Source: BBC Online