What is the primary function of placards used in crime scene photography?

The primary function of placards in crime scene photography is to clearly differentiate various items of evidence. These placards serve as visual markers that aid in identifying and organizing the evidence captured in photographs, ensuring that each piece is clearly labeled with pertinent details such as case numbers, item numbers, dates, and descriptions. This labeling helps investigators and analysts to easily associate the visual information with specific items and their respective locations in the crime scene, thus maintaining the integrity and clarity of the documentation process. Properly using placards not only helps in the legal aspects of evidence presentation but also supports the investigative process by ensuring that all relevant information is easily accessible and recognizable within the photographic records.