Discover why some prison populations have an unusually high rate of inmates who have returned to jail after their release in this media gallery adapted from FRONTLINE: Prison State. Under a reform act, Kentucky has allowed a number of nonviolent prisoners early release in order to save tax dollars. However, the prison system experiences a large number of inmates who are released only to be rearrested for violating terms of their parole. Mental illness and substance abuse are often the cause. According to some experts, the conditions for release, which require monthly payments, regular meetings with a parole officer, employment, and more, are very difficult to satisfy.