PORT-AU-PRINCE, Haiti — The police in El Salvador have begun an investigation into whether a man suspected of leading a trafficking ring involving Central American and Caribbean women and girls is also a legal adviser to the Americans charged with trying to take 33 children out of Haiti without permission. . . . Judge Saint-Vil also said he thought that the photo of the trafficking suspect in a Salvadoran police file appeared to be the same man he had met in court. He said he intended to begin his own investigation into whether a trafficking suspect had been working with...