The governor of Arizona is ordering Uber to stop testing its driverless cars after an accident last week that left a pedestrian dead in Tempe. Reports are also emerging that Uber's self-driving technology had been faltering months before the fatal crash. Global digital currencies are crashing Tuesday as Twitter's crypto ad ban goes into effect. Bitcoin, one of the most popular digital coins, was trading as low as $7,754 at one point on Tuesday. The social media company joins Google and Facebook in banning crypto-related ads on its platform. Twitter says this ban is aimed at protecting investors against fraud. Actress and TV personality Maria Menounos joins us to preview the second annual "Beverly Hills Dog Show." The show, presented by Purina, pairs dogs with the stars who love them. The show airs Sunday, April 1st on USA Network.