There are three main areas of forensic science that are required for a criminal investigation:
- Field Officer: a technician that visits the scene of a crime, documents, records the scene by taking notes, photographs and videos, and collects the physical evidence that is suspected of relating to the crime.
- Lab Officer: a technician that performs a thorough examination and analysis of the evidence collected by the field officer.
- Other Officer: responsible for interviewing potential witnesses, detaining and questioning potential suspects of a crime.
Often these officers have a specific area of expertise that includes one or more of the following disciplines:











