Forensic Crime Scene Data

Forensic crime scene data is the key information used to detect and preserve evidence found at the scene of a crime. This data assists law enforcement with determining the sequence of events and the parties involved. The best forensic crime scene data is DNA evidence, as this type of evidence holds up well in court to identify or eliminate suspects.

There are two types of evidence used in criminal and civil cases. Testimonial evidence is not as reliable as physical evidence; it is contingent upon people's memories and perceptions. Physical evidence supports testimonial evidence, and it corroborates a witness' statement and often fills in missing information.

Collection techniques of physical evidence vary based on the type. Fluids are collected with a cotton swab, whereas solids are vacuumed or scraped. Investigators also take pictures of the crime scene before evidence is collected to show placement and to prove the evidence was found where it was documented.

The type of forensic scientist who collects evidence and analyzes it is usually determined by a specialty, such as toxicology, firearms, pathology and biology. These experienced professionals often serve as expert witnesses and normally have advance degrees, memberships in organizations related to their field and years of experience.

Scientists and investigators approach a crime scene in a principled and disciplined approach to use the evidence to reconstruct what happened and find more forensic data.