Understanding Forensic Science

What to Know if You're Considering a Career in the Field

A forensic scientist jobs collecting samples from a grassy crime scene.

Monty Rakusen/Cultura / Getty Images

The Latin word forensis means "public discussion or debate." When you combine forensics and science, you get the practical application of science to matters of debate, which in modern times translates to the law.

Forensic Science and the Law

Forensic science can prove the guilt or innocence of a defendant in criminal law, and it can help resolve a broad spectrum of legal issues in civil actions through the identification, analysis, and evaluation of physical and other evidence.

But an accurate forensic science definition extends beyond the traditional concept of science. It can include the areas of accounting, psychological testing, and interpretation of data and other evidence.

In the scientific sphere, forensics can include DNA analysisfingerprinting, autopsies, pathology, and toxicology, all of which can be used to determine the cause of death and to link a suspect to a crime. 

Forensic scientists and law enforcement officials use cutting-edge scientific techniques to preserve and examine evidence in a process known as "chain of evidence." This process ensures that evidence is pure and has not had an opportunity to become tainted through mishandling. Keeping meticulous records allows forensic scientists to show exactly who was in possession of evidence at any given time and when and how transfers of the evidence were made.

Forensic science can also involve an analysis of electronic or digital media—think wiretaps and recovering "erased" information from computer hard drives. It might mean an exhaustive reconstruction of business or financial records to track sources of hidden income or expenses, or psychological profiles and evaluations of those involved in crimes or a lawsuit.

What a Forensic Scientist Does

A forensic scientist is typically charged with much more than just digging into the facts of a case and substantiating or disproving them based on an interpretation of the evidence. Strong record-keeping skills are crucial because they will often be called upon to testify to their findings in court.

Such scientists are typically required to submit written reports to the court and opposing counsel as well, detailing the nature of their findings and testimony before trial. These reports can be extensive and complex. Forensic scientists must be able to demonstrate how they arrived at their conclusions.

A forensic scientist often serves as an expert witness at a trial. They aren't a party to the incident that gave rise to the lawsuit or criminal trial and they can't testify to the facts of the case. Rather they testify to their interpretation of them. They have the training and credentials to pose an opinion regarding various aspects of the case.

The opposing party reserves the right to cross-examine and challenge the forensic scientist's findings. One challenge might be that the scientist might have processed physical evidence incorrectly.

Types of Forensic Science Jobs

Forensic science includes a good many general jobs, but positions in this field also cover a broad spectrum of specialties. You can pretty much match any one of them to your area of interest and expertise.

Blood Spatter Analyst

A blood-spatter analyst is charged with analyzing blood samples both at the scene of a crime and in the lab. This type of analyst can also work with trace evidence.

Document Examiners

Think issues of handwriting analysis here. Document examiner positions can also involve detection of altered images and print copies.

Forensic Anthropologists

Similar to medical examiners, forensic anthropologists deal with human remains to derive information such as the age or race of a victim. In fact, they typically work under the supervision of a medical examiner. They're less likely to work with recent corpses than bones and other remains, however.

Medical Examiner

The position of medical examiner pays very well but it also requires a good bit of schooling — you must have a medical degree in addition to a four-year degree and additionally complete a residency. This position involves conducting autopsies and determining a cause of death.

Forensics Technicians

Forensics technicians are often employed in the field to collect evidence in such a way as to preserve the chain of evidence.

Forensic Accounting

Another less scientific area that you might want to explore is forensic accounting. If secrets hidden in numbers intrigue you, this position involves digging for evidence in financial records.

Forensic Engineering

Forensic engineering might be for you if structures and their anomalies are what get your blood pumping.

Forensic Artists

Many detectives and investigators do double duty to accommodate this role, but some larger law enforcement agencies have artists on staff. They can create composites based on witness testimony as well as age progression images and other visual aids for trial.

Laboratory Analyst

The range of evidence handled by a laboratory analyst can be more complex, stretching to collecting DNA evidence and performing analyses of weapons as well.


Toxicologists investigate blood and tissue samples for substances such as alcohol, drugs, or even poisoning. Both laboratory analysts and toxicologists typically operate out of labs, as do fingerprint analysts and ballistics analysts, who work with solely with firearm evidence.

Educational Requirements

A career in one of these sciences generally requires at least one four-year college degree in one of the natural sciences, most commonly in the forensics field that you wish to pursue, but there are exceptions.

An accounting degree is typically necessary if you want to engage in a field of financial analysis. Pathologists, on the other hand, must first earn a medical degree and doctors of osteopathic medicine (DOs) must additionally be certified by the American Osteopathic Board of Pathology.

You might consider a broader major like criminal justice if you haven't yet pinned down your exact area of interest. A secondary degree specifically in forensics can help you get your foot in the door. And some entry-level positions might simply require former law enforcement experience—you can learn more on the job.

If you have an inquiring mind and like to advocate for the truth, forensic science may be the career for you.