 A Washington state trial against McKesson Corporation NYSE: MCK, Cardinal Health Inc NYSE: CAH, and AmerisourceBergen Corp NYSE: ABC for the U.S. opioid epidemic is slated to kick off today, Reuters reported. Washington Attorney General Bob Ferguson declined to join a 26 billion nationwide settlement and has accused the drug distributors of creating a public nuisance by failing to prevent the diversion of prescription pills into illegal channels. 