In the investigation and prosecution of most sexual assault cases, the role of the victim is much more important than in other crimes since the victim is usually the sole witness to the crime. Unfortunately, sexual assault victims are sometimes reluctant to cooperate with law enforcement because they fear the perpetrator will return to retaliate or they won’t be believed. It is therefore imperative the sexual assault investigators understand victim responses and utilize the appropriate interview skills necessary in these cases. Not all victims of sexual assault behave in the same manner, so it is essential the investigator be informed, of mental and physical reaction to sexual assault. Understanding and working with your victim is crucial to successfully prosecuting these cases.