2010/05/18 Headlines: Tar Balls in Florida Keys, Oil Plumes Raise Fears of Wider Spill; MMS Official Steps Down; 5 US Troops Among 18 Killed in Afghan Bombing; Supreme Court Issues Rulings on Teen Sentencing, Jailing Sex Offenders; US Downplays Iran Deal, Vows Continued Sanctions Effort; Study: Pentagon Falsely Claimed Missile System Success; Attorney: Video Contradicts Police Claim in Home Raid Killing of 7-Year-Old; Staffers at Rhode Island Public School to Keep Jobs; Civil Rights Groups File Suit over Arizona Immigration Law; 3 Undocumented Immigrants Risk Deportation in Protest for DREAM Act; Barred by Israel, Chomsky to Deliver West Bank Lecture by Video Feed; Following Boycott Calls, Elvis Costello Cancels Israel Concerts; Mothers of Jailed US Hikers Head to Iran; Report: Blumenthal Falsely Claimed to Have Served in Vietnam