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Crime scene investigators are specialized law enforcement personnel, who apply their forensic science knowledge to the documentation of a crime scene. They collect and analyze evidence such as tire tracks, footprints, blood splatters, and many other elements of a crime scene to piece together theories about what occurred, the sequence of events, and how long ago they transpired.

Law enforcement agencies often lump together all sorts of personnel under the title of crime scene investigator, but for the purposes of this article, a crime scene investigator is a sworn peace officer with expertise in collecting and analyzing evidence gathered from crime scenes. An evidence technician is someone who gathers and processes crime scene evidence but is not necessarily a peace officer and is not involved in other aspects of investigating crimes.

Forensic science dramas on television have increased the popularity of crime scene investigation as a career. Those shows may also have affected the publics expectations of what crime scene investigators can bring to criminal prosecution. Many law enforcement personnel and prosecutors believe that such television programs have made jurors less likely to convict criminals when the prosecution does not present significant amounts of high-quality forensic evidence. Academic research has yet to prove the so-called CSI effect.

Crime scene investigators assist detectives in solving crimes by sorting through evidence and details to assist prosecutors in building a case. Their tasks include:

Crime scene investigators assist with collecting evidence and providing expert analysis of that evidence. They are often called as witnesses in criminal cases to explain their theories about what happened at a crime scene.

In a case, the crime scene investigator is called to the crime scene once law enforcement has already discovered or been called to the scene. The investigator assists in blocking off the scene from outside contamination, which could include helping uniformed officers set up barricades and caution tape and protecting evidence from damaging weather such as rain, sleet, hail, wind, sun, and snow.

The crime scene investigator identifies, collects, and inventories evidence at the crime scene. They take photographs of the scene and of individual pieces of evidence, while also ensuring that the methods used to collect and process the evidence will stand up to scrutiny by defense attorneys. A judge can disallow improperly processed evidence.

The investigator works with outside crime labs to analyze evidence that is beyond the departments capability to analyze. For example, a large police department might send bullet fragments to a state ballistics lab if the department does not have a ballistics experton staff.

The U.S. Bureau of Labor Statistics includes crime scene investigators under the category forensic science technicians. The salary for this career is as follows:

Payscale.com does provide the salary for crime scene investigators as follows:

Source: Payscale.com, 2019

Because crime scene investigators are sworn police officers, those wishing to become a crime scene investigator should research the requirements for becoming a police officer in local and surrounding jurisdictions, as these requirements may vary among jurisdictions. Generally, the following education, experience, and certifications are required:

To learn about the specific requirements for employment in your area, contact your local police department, the sheriff's department, and the state police to inquire about crime scene investigator qualifications at their facility.

Crime scene investigator positions are not entry-level jobs. They require the following skills:

According to the U.S. Bureau of Labor Statistics, 2017, the job outlook for crime scene investigators, included under the classification for forensic science technicians, is expected to grow 17% up to 2026.

Jobs are found in large police departments and state police organizations. Smaller departments do not have the manpower to devote a position solely to crime scene investigation.

This work requires traveling to areas that may be challenging to navigate due to difficult terrain, bad weather, or debris. In addition, crime scenes may be emotionally upsetting, gory, and difficult to view.

Crime scene investigators may work staggered day, evening, or night shifts and may have to work overtime because they must always be available to collect or analyze evidence.

People interested in crime scene investigation work should also consider the following similar career paths (along with median annual salary):

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Crime Scene Investigator Job Description: Salary, Skills ...