<human>: Is there a way to find out if someone is a serial killer before they kill someone?
<bot>: Yes, there are several ways. One of them is by analyzing the crime scene and looking for evidence that might indicate whether or not the killer has killed before. Another method is to analyze the victim’s body after death, searching for signs of trauma or injury. A third method is to look at the suspect’s history, including their family background and any previous criminal activity.