Is it really a safe assumption that all states have identical rates of fraud? Different states have very different economic and social situations that could pressure somebody into committing fraud. Some states are suffering more than others with prescription drug abuse. Some states have industries that result in more disabilities than other states \cough{coal mines...}

In West Virginia 8.9% of the working age population receives disability, while in Hawaii only 2.8% do. In Tennessee, 6.5% of the working age population is on disability. The national average is 4.6%