Plot: 2012/03/28 Headlines: Supreme Court in Final Day of Healthcare Hearings; Report: Detective Sought Charges in Trayvon Martin Killing; Trayvon Martin's Parents Address Hate Crimes Panel; EPA Proposes Greenhouse Gas Limits for Power Plants; Afghan Soldiers Arrested for Plotting Defense Ministry Attack; Former Polish Intel Head Charged for Role in Secret CIA Prison; Syria: Dozens Killed Despite Ceasefire Proposal; Gas Could Flow for 6 Months in North Sea Leak; Scientists Warn Global Warming Damage Will Soon Be Irreversible; Arizona Senate Votes to Ban Abortion After 20 Weeks; Christian Militia Members Acquitted of Conspiracy; Jailed Environmentalist Moved to Isolated Cell; U. S