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- Crime scene investigation is, by its most basic definition, the method of protecting, processing and reconstruction of a crime. It doesn't matter where the crime took place or if there are more than one crime scenes involved.
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Crime scene investigation is, by its most basic definition, the method of protecting, processing and reconstruction of a crime. It doesn't matter where the crime took place or if there are more than one crime scenes involved.
The key principle underlying crime scene investigation is a concept that has become known as Locard’s Exchange Principle. It states that whenever someone enters or exits an environment, something physical is added to and removed from the scene.
- Trace Evidence
- Body Fluids
- Hair and Fibers
- Fingerprints
- Footwear Impressions and Tool Marks
- Firearms
- Documents
Trace evidence might include gun-shot residue (GSR), paint residue, chemicals, glass and illicit drugs. To collect trace evidence, a CSI might use tweezers, plastic containers with lids, a filtered vacuum device and a knife. He will also have a biohazard kit on hand containing disposable latex gloves, booties, face mask and gown and a biohazard was...
Body fluids found at a crime scene might include blood, semen, saliva, and vomit. To identify and collect these pieces of evidence, a CSI might use smear slides, a scalpel, tweezers, scissors, sterile cloth squares, a UV light, protective eyewear and luminol. He'll also use a blood collection kit to get samples from any suspects or from a living vi...
A CSI may use combs, tweezers, containers and a filtered vacuum device to collect any hair or fibers at the scene. In a rape case with a live victim, the CSI accompanies the victim to the hospital to obtain any hairs or fibers found on the victim's body during the medical examination. The CSI seals any hair or fiber evidence in separate containers ...
Tools for recovering fingerprints include brushes, powders, tape, chemicals, lift cards, a magnifying glass and Super Glue. A crime lab can use fingerprints to identify the victim or identify or rule out a suspect. There are several types of prints a CSI might find at a crime scene: A perpetrator might leave prints on porous or nonporous surfaces. ...
A latent fingerprint is an example of a two-dimensional impression. A footwear impression in mud or a tool mark on a window frame is an example of a three-dimensional impression. If it's not possible to submit the entire object containing the impression to the crime lab, a CSI makes a casting at the scene. A casting kit might include multiple casti...
If a CSI finds any firearms, bullets or casings at the scene, she puts gloves on, picks up the gun by the barrel (not the grip) and bags everything separately for the lab. Forensic scientists can recover serial numbers and match both bullets and casings not only to the weapon they were fired from, but also to bullets and casings found at other crim...
A CSI collects and preserves any diaries, planners, phone books or suicide notes found at a crime scene. He also delivers to the lab any signed contracts, receipts, a torn up letter in the trash or any other written, typed or photocopied evidence that might be related to the crime. A documents lab can often reconstruct a destroyed document, even on...
- Julia Layton
Crime scene investigation involves collecting, preserving, and analyzing evidence and other data found at crime scenes. Forensics experts who participate in these processes play vital roles in the legal system.
At a scene, the case investigator and crime scene personnel work together to: define and secure areas that may contain evidence; examine and document the scene; collect physical evidence; and preserve, package and submit the evidence to the laboratory for analysis.
Crime Scene Investigators. CSIs preserve crime scenes, conduct systematic searches for evidence, and collect and preserve physical evidence. They also conduct interviews with witnesses. Additionally, they photograph crime scenes, evidence and the bodies of any deceased victims.
May 20, 2024 · Crime scene investigation is a forensic specialization dedicated to recovering, gathering, and preserving physical evidence from crime scenes. It aims to help police reconstruct events, identify possible suspects, and solve crimes.
