Every piece of evidence collected tells a story—but only if it reaches the courtroom in its original, untampered state. Preserving the integrity of evidence begins at the crime scene, where the right tools, such as tamper-evident bags, are essential to avoid legal challenges.
This guide explains how to label and seal evidence bags effectively, outlining best practices to prevent contamination and maintain security measures throughout the process. From the importance of proper documentation to avoiding common pitfalls, this article is your comprehensive resource for ensuring the safety and reliability of crucial evidence.
Why is the Proper Procedure of the Evidence Bag Critical?
Proper labeling and sealing of evidence bags are foundational to maintaining the chain of custody. The chain of custody is the chronological paper trail that documents every person who has handled the evidence, from the moment of collection to its presentation in court.
Failing to label or seal an evidence bag properly can have severe consequences.
- Contamination: An improper seal can allow contaminants in or allow biological evidence to degrade, potentially compromising critical findings.
- Tampering: Without tamper-evident seals, a bag could be opened and its contents altered without any clear indication.
- Inadmissibility: Any gap or mistake in the chain of custody or evidence integrity can lead to that evidence being challenged and potentially excluded from trial, jeopardizing the entire case.
Ensuring meticulous labeling and using reliable sealing methods are non-negotiable practices in evidence handling.
Essential Preparations Before Labeling and Sealing an Evidence Bag
Before handling any evidence, preparation is key. Having all your supplies ready ensures a smooth, secure, and uncontaminated collection process.
Essential Supplies Checklist:
- Appropriate Evidence Bags: New, clean paper and plastic options.
- Tamper-Evident Security Tape: Designed to show “VOID” or other messages upon removal.
- Tamper-Evident Security Labels: For adding an extra, often serialized, seal.
- Permanent Marker: Both fine and broad tips are useful.
- Clean Gloves: Nitrile gloves are recommended; use a new pair for each item.
- Chain of Custody Log/Form: To begin documentation immediately.
These tools form the foundation of proper evidence handling and help ensure that every item collected is protected from contamination, tampering, or loss. By preparing your supplies in advance, you minimize delays and mistakes at the scene, keeping the chain of custody intact from the very first step.
Step-by-Step Guide: How to Label and Seal an Evidence Bag
Protecting evidence starts with correct labeling and sealing. And here is a clear and step-by-step process to label and seal an evidence bag:
Step 1:Select the Right Evidence Bag
Before collecting any evidence, select the right evidence bag. Consider the nature of evidence (wet, dry, fragile, etc.) and the required level of security. Prioritize tamper-evident bags whenever possible to provide a clear indication of any tampering. Select a bag of the appropriate size to hold the evidence without excessive folding or crushing comfortably. Here are the types of evidence bags:
- Paper Bags: These are breathable and essential for biological samples (wet or dry), such as bloodstained clothing or plant material. As the National Institute of Justice (NIJ) notes, using paper for wet or damp items prevents moisture buildup, which can lead to mold and degradation.
- Plastic Bags: These are durable and ideal for non-biological, dry items. This includes drugs, documents, firearms, or trace evidence that must be protected from loss.
The type of evidence dictates the type of bag. Meanwhile, the size of the bag is also important. Select a bag of the appropriate size to hold the evidence without excessive folding or crushing comfortably.
After selecting the bags, always ensure the bag is new, clean, and free from any pre-existing markings or contamination.
Step 2: Handle Evidence Correctly (Put on Gloves!)
Always wear new, clean nitrile gloves for each item to prevent cross-contamination, smudging, or the transfer of trace materials like skin oils or fingerprints. Replace gloves immediately if they tear or become contaminated during handling. Minimize direct contact with the evidence and document the name of the person collecting the item to ensure transparency.
Proper handling not only protects the integrity of the evidence but also prevents accusations of improper collection in court.
Step 3: Place Evidence Securely in the Bag
Place only one item per bag unless the items are intrinsically linked or collected as a single unit to avoid cross-contamination and confusion. Do not overstuff the bag, as extra pressure can distort or damage delicate items, compromise seals, or allow sharp objects to puncture the bag.
Ensure the evidence is laid flat or positioned gently to maintain its original condition during transport. Taking this time ensures proper preservation until it reaches the lab or evidence room.
Step 4: Label the Bag Completely & Accurately
Labeling is a critical part of maintaining the chain of custody and ensuring that the evidence can be identified and tracked throughout the investigation process.
Use a permanent marker. It’s easiest to fill out all required fields before placing the item inside, while the bag is on a flat, stable surface. Here is the essential information that should be included when labeling an evidence bag:
- Case Number: A unique identifier for the specific case.
- Item Number: A sequential number assigned to each item of evidence within the case.
- Date and Time of Collection: Precise date and time the evidence was collected.
- Location of Collection: Specific location where the evidence was found.
- Brief Description of Contents: A concise description of the items inside the bag (e.g., “One broken knife,” “Bloodstained shirt”). Avoid overly detailed descriptions that might be misinterpreted.
- Collector’s Name and Initials: The name and initials of the person who collected the evidence.
- Witness(es) Name(s) and Initials (if applicable): Names and initials of any witnesses present during collection.
These details are a standard part of forensic documentation, as outlined in guides like the California DOJ’s Physical Evidence Bulletin. It’s worth noting that the label should be permanently affixed to the bag, ideally using a waterproof marker.
Step 5: Seal the Bag Using Tamper-Evident Methods
After labeling the evidence bag, it’s essential to apply security labels and tamper-evident tape to provide an added layer of protection. These tools ensure that if someone tries to interfere with the evidence, it will be immediately apparent. This is the most critical step for security.
- Fold the Bag Opening: For paper bags, fold the top edge down several times (at least twice) to create a clean, solid edge. Plastic bags often have a designated adhesive strip.
- Apply Tamper-Evident Bag Tape: Apply a strip of tamper-evident security bag tape across the entire folded edge or opening. The tape should extend onto the bag itself on both sides. Press firmly to ensure no gaps.
- Apply Security Label: Place a tamper-evident security label over the tape/seal area. Many protocols require the collector to sign or initial across the label and onto the bag, creating a unique “signature” on the seal that cannot be replicated.
Step 6: Verify Seal Integrity
After applying the security label and tamper-evident tape, it is crucial to check the seal to ensure that it is properly adhered to. A poorly sealed bag can lead to compromised evidence, especially if the seal is easily broken or tampered with.
- Visual Inspection: Inspect the tape and labels for any visible gaps or signs that the seal might not be secure. Make sure that the tape has fully adhered to the evidence bag and that no part of the bag is left open or vulnerable to interference.
- Adhesion Test: Gently tug on the tape or security label to ensure it is firmly attached to the bag. If it is not securely affixed, replace it with a new tamper-evident tape or security label. A weak seal could jeopardize the evidence’s integrity.
By taking the time to check the seal, you ensure that the evidence is fully protected and ready for transportation to the next phase of the investigation.
Step 7: Complete Chain of Custody Documentation
The final step in the process is to document every detail of the labeling and sealing procedure. Accurate documentation is a critical part of maintaining the chain of custody, which tracks the evidence from the moment it is collected until it is presented in court. Any gaps or inconsistencies in the documentation could lead to challenges regarding the evidence’s authenticity.
The chain-of-custody log should include:
- A Record of Handling: This includes who handled the evidence, when it was handled, and where it was stored or transported. Each person involved in handling the evidence must sign and date the log to confirm their role in the chain.
- Log of Seals: Document the types of security labels and tamper-evident tape applied, including serial numbers or other identifying features. This allows investigators to trace back to the exact materials used to seal the evidence.
- Any Changes in Custody: If the evidence is transferred between individuals or locations, each step must be documented in the log to ensure full transparency.
By maintaining a clear and accurate chain-of-custody log, investigators can ensure that the evidence remains secure and uncompromised throughout the investigation, ultimately supporting its admissibility in court.
Evidence Bag Handling Mistakes That Compromise Evidence Integrity
Even small oversights can have serious consequences. Avoid these common pitfalls:
- Using Non-Tamper-Evident Materials: Using regular office tape, standard sandwich bags, or non-security labels. These do not show clear signs of tampering and will compromise the evidence.
- Incomplete or Illegible Labeling: Forgetting a case number, date, or collector’s name, or using a pen that smudges or fades.
- Do Not Test the Seal’s Integrity: Many times, investigators assume the seal is secure, but a weak seal can result in contamination or tampering.
- Cross-Contamination: Reusing gloves between items or placing multiple items from different locations in the same bag.
- Breaking the Chain: Forgetting to log a transfer of custody, even for a short time.
To maintain integrity in the chain of custody, it’s essential to avoid these mistakes in evidence handling. Always handle evidence with care, minimizing direct contact and ensuring it is stored in a secure location immediately after collection. Keeping evidence in tamper-evident bags and using security labels ensures that any potential tampering will be immediately noticeable.
FAQs
Q1: What type of evidence bag should I use for biological samples?
For biological samples, use paper evidence bags that allow the contents to breathe and prevent contamination.
Q2: How do I know if my security label is tamper-evident?
A tamper-evident security label will show visible signs of damage or tampering if removed or altered.
Q3: Can I reseal an evidence bag once it’s been opened?
Once an evidence bag is opened, it should not be resealed, as it could compromise the integrity of the evidence.
Q4: Why is labeling the evidence bag before sealing important?
Labeling before sealing ensures legibility, avoids smudging, and prevents damaging delicate items by writing on the filled bag.
Conclusion
Ensuring that evidence is properly labeled and sealed is essential for maintaining its integrity. By taking the necessary precautions, such as using tamper-evident solutions and documenting every step, investigators can safeguard the evidence from contamination or tampering. This process is crucial for maintaining the chain of custody and ensuring the case’s credibility in court.
Don’t Risk It – Protect Your Evidence with Shosky Today!
Protect your evidence with Shosky Security’s range of tamper-evident products. From bags and security labels to tamper-proof sealing tapes, we provide everything needed to ensure the safety and integrity of your evidence. Contact us today to discover how we can help you secure your critical materials.
