Spain student visa: FBI check, apostille and translation

A Spanish study plan is really three separate files: academic admission, the visa itself and, if it comes up later, credential recognition. The FBI check belongs only to the immigration file, and it follows a specific federal route that should not be confused with the path other documents in the same application take.
For a study visa of more than 180 days in the Washington consular district: FBI Identity History Summary, then a federal apostille from the U.S. Department of State, then an official/certified Spanish translation. A state apostille will not work for the FBI report.