i'm joined by william jawando who worked on these issues for president obama. >>> plus, the writer and activist angela davis. >>> also ahead, america's opioid addiction crisis. i speak to the journalist barry mayer who says farmer executives knew that prescription opioids were being widely abused. >>> good evening, everyone, and welcome to the program. i'm christiane amanpour in london. as america continues to grapple with racism, today abc has canceled its highly rated sitcom "roseanne" after the star, roseanne barr, posted a tweet that the network calls abhorrent, repugnant, and inconsistent with our values, aka racist. this as a rare and massive effort got under way today in the united states to root out ingrained sometimes unconscious prejudice across the entire starbucks workforce. the global coffee empire closed more than 8,000 of its cafes around the u.s. for several hours so that some 175,000 employees could take anti-bias training. starbucks ordered the nationwide training day after what even its founder calls an unbelievable incident that took place in philadelphia last month