Authorities spent many years trying to identify specific motivations for serial killers, then applying them to several typologies developed by the Serial Killer Classification (Morton). Common motives include, but are not limited to, anger, criminal enterprise, financial gain, ideology, power/emotion, psychosis, sexuality (Morton). In some cases the motive may be difficult to determine and there may even be multiple motives for the killer. The reason may be a mental disorder such as psychopathy which is defined as “Psychopathy is a psychological condition in which the individual shows a profound lack of empathy for the feelings of others, a willingness to engage in immoral and antisocial behavior for financial gain. short term". , and extreme self-centeredness.” (Schouten Silver 18) This cannot be determined by observation and therefore can make it difficult to capture the killer on the loose. A serial killer's motive can vary from murder to murder or alter over the course of the killing spree. Even once the motive is identified, it may not be of any use to the investigation.