LAFAYETTE, La. (AP) - A federal judge has ruled a decades-old desegregation lawsuit against the St. Martin Parish School Board remains open despite a lack of court activity in the case since the 1970s. The decision doesn't necessarily mean the school system will see any operational changes, but it leaves opens the door for possible scrutiny by the Justice Department and others. The School Board maintained the desegregation suit was dismissed in 1974. The Justice Department and attorneys for the NAACP Legal Defense Fund argued the case was never technically closed. In a 32-page ruling, U.S. District Judge Elizabeth Foote agreed, citing, among other things, the ambiguity of a 1974 ruling that the School Board said closed the case.