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Forensic Science Crime Marker Cards

What are Forensic Science Crime Marker Cards?

Forensic Science Crime Marker Cards, also known as Evidence Markers, are tools used within a crime scene to help investigators identify and document evidence. They're typically small, brightly colored cones or tents, often with numbers or letters on them, placed next to each piece of potential evidence.

What is the purpose of the bright colors and numbers on the cards?

The bright colors and numbers on the cards serve to make each piece of evidence stand out, especially in photographs. The numbers or letters allow for easy documentation and cataloging of the evidence in the order that it was located.


How do investigators position these markers at a crime scene?

Investigators place these markers adjacent to each piece of potential evidence. The positioning is done in such a way that they're clearly visible but not disturbing the evidence itself.

Can you explain the process of documenting and cataloging evidence using these markers?

As each piece of evidence is found, a marker is placed next to it. The investigators then photograph the scene with the markers in place, and make a sketch or map of the scene. Each numbered or lettered item is then described in detail in their notes.


When are Crime Marker Cards typically used during an investigation?

Crime Marker Cards are used during the initial stages of an onsite investigation. As soon as the crime scene is secure and the preliminary survey is complete, the evidence collection process, which includes the use of these markers, begins.

What is the initial process before applying Crime Marker Cards?

Before applying Crime Marker Cards, the investigators must secure the scene to ensure no evidence is disturbed. They then conduct a preliminary walkthrough or survey to get an overall picture of the scene and figure out where to place the crime marker cards.


Are there standard sizes for these cards?

Yes, most Crime Marker Cards come in a standard size to keep consistency across crime scenes. However, the size may vary based on the manufacturer or specific needs of the investigation. A typical size is around two inches high.

How does the size of the marker cards impact the evidence documentation process?

The size of the marker cards needs to be suitable to make them visible in photographs, but not so large that they obscure or disturb the evidence. A standard size ensures consistency and reliability in the evidence documentation process.


Can you give any real-world examples of these crime marker cards in use?

Crime Marker Cards are frequently seen in use in high-profile investigations. For example, they were used extensively during the investigation of the O.J. Simpson case. They have also been used in many other investigations to aid in the thorough and methodical collection of evidence.

How did the use of crime marker cards contribute to the O.J. Simpson case investigation?

In the O.J. Simpson case, the extensive use of crime marker cards helped investigators meticulously document and later present the abundant physical evidence found at the scene. The photographed markings and the subsequent presentation in the courtroom were critical to the prosecution's case.