During the 1920s and 1930s, GAO focused on preaudit payment work and whether government spending had been handled legally.
They looked during the 1990s to see if the system was corrupt.
mnli hypothesis: They looked during the 1990s to see if the system was corrupt. premise: During the 1920s and 1930s, GAO focused on preaudit payment work and whether government spending had been handled legally.