Medicare Part D is the bit of law involved. Here is a randomly googled column with some history from a reputable paper: http://www.latimes.com/business/hiltzik/

Medicare Part D is the bit of law involved. Here is a randomly googled column with some history from a reputable paper: http://www.latimes.com/business/hiltzik/la-fi-hiltzik-medicaire-negotiate-20170111-story.html http://www.latimes.com/business/hiltzik/la-fi-hiltzik-medica...