The parents of slain Florida teen Trayvon Martin, Sybrina Fulton (R) and Tracy Martin, look toward the crowd in tears toward the end of a rally protesting the shooting of their son Trayvon Martin in Miami, Florida April 1, 2012. Attorneys for the family of slain black teenager Trayvon Martin are asking the U.S. Justice Department to review reports that prosecutors undermined a police investigation of shooter George Zimmerman by overruling a detective who wanted to charge him. REUTERS/Brian Blanco (UNITED STATES – Tags: CRIME LAW CIVIL UNREST)