What is a rape kit?

A rape kit is described as "The biological and physical evidence collected from a victim of a sexual assault is collectively known as a “rape kit.” The term is also used to describe a case which holds necessary equipment for carrying out an examination on a rape victim. A rape victim is always allowed to decline a rape kit and still receive medical treatment, although collection of evidence is strongly encouraged. In addition to leading police to the perpetrator, a rape kit can also bolster the case in court, should it come to trial." as described by http://www.wisegeek.com/what-is-a-rape-kit.htm. I believe the rap kit is very useful and will be vital in helping people who are victims of rape.