Field Notes: Systematic Recording & Scene Narrative

Why Field Notes Are the Foundation of Every Case

Field notes are the first and most permanent record of what you observed at a crime scene. Photographs, sketches, and laboratory results all depend on accurate notes to establish context. In court, a defense attorney will compare your notes against every other piece of documentation. Any contradiction — a timestamp that does not match the evidence log, an item described in notes that never appears in photographs, a location description that does not match the sketch — can be used to challenge the integrity of the entire investigation. Your notes must be complete, consistent, and written in non-erasable blue or black ink on agency-approved forms. Never use pencil. Never use white-out. If you make an error, draw a single line through it, initial it, and continue.

The Standard Field Note Structure

Most agencies require field notes to follow a consistent structure so that any supervisor or prosecutor can read them in a predictable order. Adopt this structure every time:

1. Agency Header

Record your agency name, case number, date, and the address or GPS coordinates of the scene. Include the type of incident as initially reported (for example: "reported residential burglary"). The header anchors every subsequent detail to an official record.

2. Personnel Log

List every person present at the scene by full name, rank or title, agency, and the exact time they arrived and departed. This log serves as your chain of custody foundation. If a detective arrived at 09:14 and left at 11:30, write exactly that. Use 24-hour time (0914, 1130) to eliminate AM/PM ambiguity, unless your agency standard specifies otherwise.

3. Weather and Environmental Conditions

Record conditions at the time you arrive and update them if conditions change significantly during your documentation. Include temperature if available, sky conditions (clear, overcast, raining), lighting level (full daylight, dusk, artificial lighting only), and any environmental hazards — standing water, strong odors, biological material, or potential chemical exposure. These details affect evidence interpretation: blood spatter patterns differ on wet versus dry pavement; fingerprint development methods must account for humidity.

Safety note: Before entering any scene, assess for hazards. If you detect unknown chemical odors, do not enter without respiratory protection and guidance from a hazmat team. Biological material (blood, tissue) requires, at minimum, nitrile gloves and eye protection. Follow your agency's PPE protocol before your pen touches the paper.

4. Scene Orientation and Boundaries

State compass north orientation — this links your notes to your sketches and photographs. Describe the boundary of the scene: where the perimeter tape is set, what natural or constructed features define the area. Provide precise measurements or references ("north wall of the garage, 12 feet east of the personnel door").

5. Scene Narrative

This is a chronological, active-voice description of what you observed as you moved through the scene. Active voice means you are the subject performing the observation: "I observed a shattered window on the south wall" — not "a shattered window was observed." Active voice eliminates ambiguity about who made the observation. Write in the order you encountered items. Each observation should include:

• A precise location reference
• A physical description (size, color, condition, orientation)
• The time you documented it
• The item number if it is to be collected as evidence

6. Itemized Evidence List

Every item collected or photographed as potential evidence gets its own numbered entry. The entry includes: item number, description, location found, condition, collection method, collector's name, packaging used, and time of collection. This list must match your photographs exactly. If a photograph shows Item 7 as a partial shoe impression in soil near the east fence post, your evidence list entry for Item 7 must describe that impression at that location.

Active Voice and Precision: The Two Rules

These two rules prevent most courtroom challenges to notes.

Active voice keeps every observation attached to a named observer. Compare these two sentences: "A blue handled knife was located on the kitchen counter" versus "I located a blue-handled kitchen knife on the east kitchen counter, approximately 6 inches from the north edge of the countertop." The second sentence tells the court who found it, what it looked like, and exactly where it was.

Precision means specific measurements, specific colors, specific orientations. "Near the door" is not a location. "On the floor, 18 inches east of the interior face of the front door" is a location.

Timestamps and Continuity

Every significant action gets a timestamp: when you arrived, when you began photography, when you opened a drawer, when you collected each item, when you departed. Timestamps establish the sequence of events and protect you if the defense claims evidence was moved or contaminated. A continuous timestamp log also shows that the scene was not left unattended during documentation.

Consistency with the Photographic Record

Your notes and photographs must tell the same story. When reviewing your own notes against your photos — as you will practice in today's activity — check: Does every item I photographed appear in my notes? Does every item in my notes appear in at least one photograph? Are location descriptions consistent between the two records? A contradiction between a note and a photograph is a vulnerability in your case.