Many of these emergency powers derive from authority to reduce sentences without regard to behavior, and the pressure to use these powers as a means of relieving overcrowding is growing. Detractors of early release programs call them a cause of higher crime rates, while supporters claim that the recidivism rate for offenders given early release is equal to or lower than that of those released at the normal times. Interest in emergency release may wane across the country as a result of the Michigan incident. Some States use good time as a punishment, rather than a reward. Other jurisdictions have resorted to using "safety valve" systems that reduce sentences incrementally in order to reduce prison populations.