What was a consistent feature found at the crime scenes?

A consistent feature found at crime scenes often points to the habits or methods of the perpetrator. Discarded shoes could indicate an attempt to dispose of evidence, reflect the suspect's movements during the crime, or serve as an indication of the lengths the suspect went to evade capture. This highlights a pattern or signature behavior that can be critical in linking multiple crime scenes or identifying a suspect.

In contrast, broken windows might suggest forced entry but would not consistently appear in all crime scenes. A lack of evidence typically indicates an unsuccessful or planned effort to conceal wrongdoing but is less about a definitive feature. The presence of witnesses can vary greatly from one crime scene to another and is not a reliable marker across different incidents. Therefore, the presence of discarded shoes stands out as a recurring element that can aid in the investigation and analysis of crime patterns.