Procedure for Collecting Evidence at a Crime Scene: When Do Investigators Need CSI/Forensic Specialists?

Introduction:

The collection of evidence at a crime scene is a critical process that determines the success of any criminal investigation. The need for specialized teams, such as Crime Scene Technicians (CSIs) and forensic specialists, varies depending on the type of crime, the complexity of the scene, and the resources available.

Training and Basic Scene Processing

Many local law enforcement officers receive basic training in crime scene processing. This includes tasks such as:

Dusting for and lifting latent prints Collecting swabs from potential DNA evidence like blood or other bodily fluids Omitting elimination prints or swabs from victims Photographing the scene Handling and packaging evidence

These tasks are typically performed by investigators themselves, especially in less complex or smaller scenes.

The Role of CSIs and Forensic Specialists

For more serious or complex crimes, such as shootings, stabbings, unattended deaths, armed robberies, sexual batteries, kidnappings, carjackings, and homicides, investigators typically collaborate closely with Crime Scene Technicians (CSIs) and forensic specialists.

The decision to call in these specialists is not just based on the type of crime but also on the complexity and size of the scene.

Coordination and Collaboration

When arriving at a crime scene, one should never assume one knows everything that needs to be done. The scene must be secured, and investigators must have a basic understanding of what occurred and where.

In major cases, it's common practice to confer with a supervisor and discuss the scene and subsequent actions. Here are the general steps:

Notify the supervisor and discuss the situation and required actions Request assistance from Crime Scene Technicians (CSIs) or forensic specialists if deemed necessary Walk through the scene with the case agent to better understand the situation CSIs can provide valuable insights and suggest additional areas of investigation

The CSIs are responsible for collecting, documenting, and preserving evidence. They can also identify additional evidence that may be relevant to the case.

Differences in Procedures Across Agencies

Procedures can vary significantly between different law enforcement agencies, with larger agencies having more resources and specialized units. For instance:

Bigger agencies with more parole and crime scene technicians may use them for a wider range of tasks In some situations, agencies may have their own CSIs, while in others, they rely on external resources for major cases

For more significant cases, such as major homicide scenes, local law enforcement might also call upon the assistance of Crime Scene Teams from the local sheriff's office.

In conclusion, the need for CSIs and forensic specialists depends on the specific circumstances of the crime and the resources available. Understanding the proper procedure and the value of these specialized teams can significantly enhance the investigation and improve the chances of a successful resolution.