Jäljentösö

Jäljentösö is a Finnish term that translates to "trace evidence" in English. It refers to small, often microscopic, pieces of material that are transferred from one person or object to another during contact. The examination and analysis of trace evidence is a crucial part of forensic science, used to establish connections between suspects, victims, and crime scenes.

Common types of trace evidence include fibers, hair, soil, glass fragments, paint chips, and biological materials like blood or semen. These items may seem insignificant individually, but their presence or absence can provide powerful clues. For example, finding a specific type of fiber on a victim's clothing that matches the carpet in a suspect's vehicle can link them to the scene. Similarly, the presence of soil particles on a shoe can indicate where an individual has been.

Forensic scientists use various techniques to collect, preserve, and analyze trace evidence. Microscopy, chemical analysis, and DNA profiling are common methods employed. The goal is to identify the unique characteristics of the evidence and determine its significance in the context of a criminal investigation. The reliability and interpretation of trace evidence are paramount, and rigorous scientific standards are applied to ensure accuracy and avoid miscarriages of justice. The principles of Locard's exchange principle, which states that every contact leaves a trace, underpin the importance of studying this type of evidence.