Forensics

Today I am going to talk about forensics

Forensics is the application of scientific methods and evidence-based analysis to investigate questions related to crime, law, and other investigations. The word “forensic” comes from the Latin word forensis, meaning “of the forum,” because ancient legal disputes were presented publicly before courts. Today, forensic professionals use knowledge from fields such as biology, chemistry, physics, psychology, computer science, and anthropology to examine evidence and help answer questions about what happened, who was involved, and how events occurred. Rather than relying on assumptions or eyewitness accounts alone, forensic science focuses on collecting, analyzing, and interpreting physical evidence to help establish facts.

Many of the most famous criminal investigations in history have relied heavily on forensic science. In the case of the O.J. Simpson trial, forensic evidence played a central role, especially through DNA analysis, blood evidence, and the examination of physical evidence recovered from the crime scene and Simpson’s property. Although the trial became known for debates about evidence handling and courtroom strategy, it also brought DNA technology into public awareness and showed how biological evidence could connect people to a crime scene.

The investigation into the Golden State Killer demonstrated how forensic science continued to evolve decades later. After years without an identified suspect, investigators used DNA recovered from crime scenes and compared it with publicly available genetic genealogy databases to identify a potential family connection. This eventually helped lead investigators to Joseph DeAngelo and showed how advances in genetics could reopen cold cases that had remained unsolved for years.

Forensic science was also crucial in identifying victims and understanding what happened during the September 11 attacks. Forensic specialists used DNA analysis, dental records, fingerprints, and other methods to identify thousands of victims whose remains were difficult to recognize. This work provided answers for families and demonstrated that forensics is not only used to catch criminals but also to identify victims and reconstruct major events.

Another well-known example is the Boston Marathon bombing investigation, where investigators relied heavily on surveillance footage, digital evidence, and image analysis to identify the suspects. Although this case involved fewer traditional forensic techniques like DNA analysis, it showed how modern forensics includes digital evidence, video analysis, and the examination of electronic information.

Get Peter Miller’s stories in your inbox

Join Medium for free to get updates from this writer.

Remember me for faster sign in

These cases show that forensics is not simply about solving crimes like it is portrayed on television. It is a broad field that uses many different scientific tools to answer questions about identity, events, and evidence. Sometimes forensics helps convict a suspect, sometimes it clears an innocent person, and sometimes it simply helps families and investigators understand what happened.

Here are 10 key vocabulary words in the field of forensic science

1. Evidence — Any physical object, information, or material that can help prove or disprove something in an investigation. Examples include DNA, fingerprints, photographs, weapons, or digital records.
2. Chain of Custody — The documented history of who collected, handled, transferred, stored, and analyzed evidence. It ensures evidence has not been altered or contaminated.
3. DNA Profiling — A forensic technique that analyzes unique genetic patterns in biological material (such as blood, saliva, or hair roots) to identify or exclude individuals.
4. Trace Evidence — Small pieces of physical material transferred between people, objects, or locations during an interaction. Examples include fibers, hair, glass fragments, paint, or soil.
5. Fingerprint Analysis (Dactyloscopy) — The examination and comparison of fingerprint patterns to identify individuals because fingerprints are generally unique to each person.
6. Autopsy — A medical examination of a deceased person’s body to determine the cause and manner of death.
7. Toxicology — The scientific study of drugs, chemicals, poisons, and other substances in the body. Forensic toxicologists analyze samples like blood, urine, or tissue to determine whether substances contributed to death or impairment.
8. Ballistics — The study of firearms, ammunition, and bullet evidence. Forensic firearms experts examine markings on bullets and cartridge cases to link them to specific weapons.
9. Forensic Anthropology — The application of biological anthropology to legal investigations, often involving the identification of human remains and estimating age, sex, ancestry, or trauma.
10. Crime Scene Reconstruction — The process of analyzing evidence, witness statements, and physical conditions to determine what likely happened during an incident.