Managing inmate behavior is the core function of jails. Historically, jails have emphasized the physical containment of inmates over actively supervising them and managing their behavior. This has resulted in problems commonly associated with jails, such as violence, vandalism, and unsanitary conditions. These problems create dangerous conditions for both staff and inmates and can be costly for taxpayers. To address this issue, the National Institute of Corrections has developed training programs, technical assistance, and information to help jails better manage inmates.