There is no Level One evidence to support the practice of bracing, and clinicians are left with conflicting and questionable inferences regarding bracing effectiveness. Some clinicians believe the evidence favors a decrease in the rate of curve progression, and based on this assumption, over half the states in the U.S. have mandated school screening programs for the detection and early treatment of scoliosis. On the other hand, groups such as the USPSTF, its British and Canadian counterparts and many individual practitioners worldwide feel the evidence is inconclusive and are therefore ambivalent about brace treatment.