Trace Preservation Materials

Introduction

Trace preservation materials are the forensic supplementary equipment that dog handlers and their service dogs carry on operations with evidentiary relevance. While the dog indicates scent trails, hidden objects, or persons, the right materials ensure that find sites are not contaminated, clues remain documented, and handover to crime scene investigation or forensic science proceeds smoothly.

Unlike the full equipment of a criminal investigation crime scene unit, K-9 unit materials focus on mobile, quickly deployable aids: marking, protection against contamination, basic securing, and complete documentation. The dog provides the search indication – the materials protect evidentiary value until professional securing takes place.

What Counts as Trace Preservation Material?

Trace preservation materials include all items used at crime scenes, on trails, or when securing K-9 finds without leaving traces themselves or damaging evidence. These include disposable protective equipment, sterile packaging, marking and barrier materials, and documentation tools.

Distinction from Basic Equipment

The K-9 unit's basic equipment – leash, harness, first aid kit – serves team handling and health. Trace preservation materials are added specifically for operations with forensic relevance:

• Basic equipment: Handling, protection, communication in daily operations
• Trace preservation materials: Evidence protection, marking, documentation, handover

Typical Deployment Scenarios

Trace preservation materials are used when K-9 units work in the following contexts:

• Tracking work and mantrailing with possible evidentiary situation
• Drug, explosives, or currency detection dog operations requiring securing
• Cadaver detection dog operations with forensic follow-up
• Support in crime scene securing before arrival of crime scene investigation
• Marking of dog indications until takeover by specialists

From Dog Indication to Evidence Securing – Process

Material Categories at a Glance

Protective Equipment Against Contamination

Contamination is the most common reason for the loss of court-admissible traces. Therefore, disposable protective equipment belongs in every trace preservation kit of a K-9 unit.

Standard components:

• Disposable gloves (nitrile, latex-free, appropriate sizes)
• Overshoes or shoe covers for crime scene entry
• Disposable coverall or protective suit in case of high contamination risk
• Face mask for biological traces or dust exposure
• Disinfectant for hands and equipment after operation end

Important rules:

1. Change gloves at each new find – never use the same gloves at multiple locations.
2. Put on shoe covers only immediately before entering the cordoned zone.
3. Dog and handler enter the crime scene only after clearance and on designated paths.
4. No personal items (phone without gloves, pen from pocket) in immediate proximity to traces.

Securing and Packaging Materials

For preliminary or – with corresponding authorization – final securing of smaller pieces of evidence:

• Paper bags in various sizes (breathable, for biological traces)
• Plastic bags only where moisture must be protected and protocol allows it
• Sterile swab kits (swabs, transport tubes)
• Sealed bags with integrated closure zone
• Cotton wool, paper for individual packaging of sharp or fragile items
• Seals and security stickers with clear numbering

Marking and Cordon

Without clear marking, dog indications and find sites are lost in operational chaos. Marking materials create visual and protocol clarity.

Barrier and marking materials:

• Barrier tape (red-white, yellow for hazard areas)
• Marking stakes and cones for outdoor operations
• Numbered find markers (weatherproof)
• Chalk or marking spray only after consultation – can affect traces
• GPS coordinate note for large-scale terrain operations

Documentation requirement for every marking:

• Time and date
• Name of handler and service dog
• Type of dog indication (sit, bark, point)
• Weather, wind direction, temperature
• Photo documentation from safe distance

Documentation Tools

Complete documentation is a prerequisite for the evidentiary value of K-9 find indications in court.

Recommended equipment:

• Waterproof operation folder with form templates
• Pen and waterproof marker (only outside trace proximity)
• Digital camera or official smartphone with photo clearance
• Measuring tape or laser distance meter for distance documentation
• Sketch pad for situation sketches
• Labels with barcode or sequential number for evidence items

Trace Preservation Materials in K-9 Operations

Role of the Dog and the Materials

The service dog works with its sense of smell and provides a search indication. Trace preservation materials support the handler in protecting this indication until specialists take over. After the indication, the dog must not unsupervised sniff or make contact at the find site – this would mix traces.

Standard Procedure for Dog Indication

1. Stop and signal – Hold dog in stable indication position, inform team.
2. Cordon – Secure immediate surroundings of indication with tape or marking, block access.
3. Document – Log photo, coordinates, wind, time, dog behavior.
4. Protect – Put on gloves if needed; no contact without clearance.
5. Report – Inform crime scene lead or crime scene investigation, standby until handover.
6. Handover – Transfer find site and documentation to responsible authority, have log signed.

Special Considerations for Tracking and Mantrailing Operations

In tracking work and mantrailing, long trails often develop across terrain and time. Trace preservation materials support here:

• Marking of direction changes and reference points
• Securing of discarded traces (cigarette butts, textile fibers) only after clearance
• Reference samples for comparison scent in sterile containers
• Wind and weather log along the trail

Close coordination with tracking work and forensic crime scene investigation is crucial – materials alone are not enough; procedure and law must be correct.

Checklist: Trace Preservation Kit of the K-9 Unit

Before every operation with forensic potential, the following checklist should be completed:

• Disposable gloves (at least 10 pairs) checked and ready to hand
• Shoe covers and protective suit if needed in vehicle
• Barrier tape and at least 10 numbered find markers
• Paper and sealed bags in various sizes
• Operation folder with blank log sheets
• Camera or official photo device charged and cleared
• Seals and numbered labels available
• Disinfectant for hands and materials after operation
• Training and authorization for use of each securing material current
• Coordination with crime scene investigation or on-site operation command clarified

After Operation End

• Dispose of gloves
• Change protective clothing
• Disinfect materials
• Complete log
• Secure photos
• Document handover
• Clear vehicle
• Debriefing with team

Storage, Maintenance, and Resupply

Like all special equipment, trace preservation materials require regular inspection:

Storage:

• Dry and dust-protected in operation vehicle or locker
• Sterile kits within shelf life
• Separate compartments for clean and used materials

Maintenance:

• Monthly visual inspection for completeness and expiration dates
• Resupply and cleaning after every operation
• Annual continuing education on forensic standards and legal changes

Resupply:

• Continuously restock consumables (gloves, bags, seals)
• Coordination with organization procurement
• Documentation in unit maintenance log

Legal and Forensic Classification

Trace preservation materials support the chain of custody: Every action must be traceable – who marked, documented, or handed over what, when, and where. The service dog as evidence and evidentiary value in court depend significantly on this documentation.

Handlers may only use materials within their authority and training. Independent forensic securing without crime scene investigation training is generally not permitted. When in doubt: mark, document, protect – and let specialists take over.