Police Evidence Bags: Types, Uses & Best Practices for Law Enforcement

Written by: Miki Wong
Last update: May 16, 2025
Police Evidence Bag

You may find yourself wondering how evidence in legal cases remains intact. You might be surprised to know that it all comes down to a small bag called an evidence bag. Such specific bags are designed to protect items such as DNA, fingerprints, and documents among others. 

Contents

Without these bags, even minor damage to the evidence could compromise trials. In addition, evidence bags are available in various sizes, shapes, and qualities, offering investigators a wide range of options to suit different needs. 

Now, you may be wondering how tamper-evident bags can be so practical. Let’s examine the types of evidence bags and their features carefully. 

What Are Evidence Bags?

evidence bag

The evidence bags are containers used to keep evidence in policing, investigative, and judicial contexts. The primary use of the evidence bags is to ensure that the evidence is in its pure state. Proper handling of the evidence bags maintains the chain of custody to keep the value of evidence intact in court.

There are several kinds of evidence bags designated for particular use. The plastic evidence bags are used for non-biological items like tools or documents.

However, paper evidence bags should be used for biological evidence. Paper bags prevent moisture, which can be a concern with plastic bags, so there will be no mold on items inside them. 

Tamper-evident bags have an advanced seal that indicates if the bag has been opened before, completely preventing any interference. These bags are ideal for holding currency or digital devices. Heat-sealed bags provide added protection. They are mostly used for preserving narcotics and small, valuable items. 

Types of Evidence Bags

tamper-evident bags

There are many types of evidence bags, and each one has been designed to preserve collected materials and their admissibility in criminal trials. Uncover them!

Bag TypeBest ForMaterialKey Features
Tamper-Evident BagCash, weapons, samplesPlasticSeal strip, barcode
Paper Evidence BagBiological evidenceKraft paperBreathable, mold-resistant
Plastic Evidence BagDocuments, clothing fibersClear plasticAirtight, transparent
Custom Evidence BagBulky/sensitive itemsVariesReinforced, barcoded

Whether used in law enforcement, laboratories, or corporate investigations, these tamper-evident evidence bags help maintain the integrity of the evidence from collection to the courtroom. Let’s explore how tamper-evident solutions can be both secure and environmentally responsible in your operations.

Tamper-Evident Evidence Bags

Tamper-Proof Evidence Bags

Tamper-evident bags are critical for evidence preservation. Investigators can know if a bag was opened before by anyone else. These bags are usually used to store cash, weapons, and biological samples

Today’s most popular brands of tamper-evident bags have been used to store cash, weapons, and biological samples, as well as resistant materials that allow the bag to be used in rough conditions. They help investigators maintain custody integrity under challenging conditions.

Plastic Evidence Bags

Such evidence bags are a practical choice for investigators. Plastic evidence bags are transparent, allowing contents to be inspected without opening and risking contamination.

evidence bag

These bags are mostly used to contain documents, clothing fibres, and fingerprint samples. They come in a resilient, airtight package, and one that cannot easily be torn apart. Some come preloaded in a Can-Shape container with a straw closure for easy use, and some have the zip-lock seal, which adds to their protection.

These simple features make plastic bags highly reliable for protecting evidence, especially when working in conditions where damage could easily occur

Custom Evidence Bags

Sometimes, a case needs something more specialized, and that’s where custom evidence bags come in. These bags can be made to fit specific needs, such as adding extra compartments, adding barcode tracking systems, or using heavy-duty materials for bulky or sensitive items. 

Writable Areas of tamper evident bag

Some are even designed to handle extreme conditions, like heat or chemicals. Agencies often work closely with manufacturers to create bags that meet their exact requirements. It’s all about making sure the evidence is safe, no matter how complex the investigation gets.

Key Features and Considerations

Read on to learn about key features to look at when selecting the evidence bag to protect your evidence best.

Tamper-Evident Bag Tape

different colors' tamper evident bag tapes

Tamper-evident bag tape is one of the critical tools to ensure the security of the evidence. It gives an indication if a bag has been opened. When tampered with, in one way or another, they change colour. 

This design proves very difficult to cover up illegal access. Their use enhances investigation since they provide solid evidence of tampering. These secure seals are essential to law enforcement to keep valuable and sensitive evidence secure. 

These seals are widely used across industries, including banking, healthcare, logistics, and law enforcement.

Writable Areas

evidence bag

These specific areas make the documentation less time-consuming. Printed lines allow users to record descriptions of the content, date, and reference number. These sections ease audits and inspections. 

By minimising manual mistakes, writable sections save time while making logbook entries. Labels are easy to read and enhance the organisation. It is possible for users to customise Information according to their requirements.

These writable zones ensure clear identification, preventing mismanagement. They are particularly useful in stressful situations where precision is critical.

Sequential Numbering

tamper evident bag

Sequential numbering adds a layer of accountability. The unique codes mean there will be no “Bag-switching” or unauthorized replacements. Every bag becomes traceable, ensuring transparency. 

Sequential numbering prevents theft or misuse of sealed bags. Auditors can match logs with specific bag numbers, creating a reliable tracking system. Sequential numbering also makes inventory control easier. 

That is why organizations apply sequential numbering to improve their security measures. It minimizes risks while building trust in processes.

Reinforced Edges

evidence bag quality testing

The bags that are designed to have reinforced edges improve durability and reliability. Thin but durable sheets do not tear, puncture, or wear away. These features protect the bag from accidental or deliberate damage. 

Stronger edges protect the content of the bag better during transit. Durability ensures the safe handling of the product, even in harsh conditions. 

Reinforced designs minimize the possibility of tampering by creating a hard-to-damage exterior. Industries needing high-security packaging prefer these sturdy solutions. 

Advanced Security Features

tamper evident bag

Advanced features take protection to the next level. Tools like security tape visibly highlight tampering attempts. These enhancements make it difficult for malicious actors to conceal interference.

Security tapes add an extra layer of reliability to the bags. Features like holograms, UV markers, or micro-texts further increase protection. These innovations deter criminals and reassure users. 

Businesses handling high-value items depend on these advanced tools to ensure safety. 

Evidence Collection and Handling Best Practices

The integrity of all criminal proceedings and investigations primarily relies on evidence collection. Every step must decrease the risk of compromised evidence from being admissible in court. In the 1995 O.J. Simpson case, improper evidence handling led to significant challenges in the trial, highlighting the importance of meticulous protocols in criminal law enforcement proceedings.

O.J. Simpson Case

Proper use of evidence bags is essential. These special bags keep evidence from being contaminated, e.g., by air, moisture, or fingerprints.  For instance, in the successful prosecution of the Golden State Killer case, the securing of DNA evidence for years proved to be fruitful in solving the case.

The true nature of evidence creates the chain of custody. Following these guidelines, law enforcement professionals must handle evidence to prevent mishandling. Misconduct of any kind would lead to evidence being thrown out of the case. 

The labeling of evidence provides critical information. Each bag includes a case number, the law enforcement agency, the officer’s name, date, suspect, victim, and crime scene location. Missing information in some cases results in unreliability of evidence.

Secure storage prevents tampering. Monitored, restricted storage areas prevent changes to the evidence. This has proved to be a way of solving cold cases where decades-old evidence has proved to be fruitful using new forensic techniques.

Selecting the Right Evidence Bag for Your Investigation

Evidence Bag

Preserving evidence begins with the right bag. Find out what to look out for when selecting bags for storage and transportation during investigations.

  • Understand the Evidence Type: Identify the type of evidence, whether it is biological, digital, or physical. For example, biological samples have to be put into special breathable paper bags since they can accumulate moisture. Digital devices have to be put into anti-static bags.
  • Prioritize Specialized Design: Choose a bag that is going to be specific to the type of evidence you are gathering. Items such as arms, drugs, or sharp items require bags that have been hardened or bags of a certain shape to avoid mishandling.
  • Evaluate Security Features: Carefully select bags that already have great security features like seals, barcodes, and sequential numbering, among others. Such features restrict unauthorized access to the contents and also provide good control over the chain of custody. 
  • Ensure Usability: Carefully select bags that already have great security features like seals, barcodes, and sequential numbering, among others. Such features restrict unauthorized access to the contents and also provide good control over the chain of custody. 
  • Focus on Quality and Durability: Opt for superior quality so as to avoid the incidences of the product tearing, getting punctured, or degrading over time. This makes sure that evidence is preserved when a case passes through hard times.

writing on an evidence bag

Selecting the right evidence bag is just the beginning. To truly protect your evidence, you must also know how to handle and use these bags correctly. The next section covers best practices for sealing, labeling, and maintaining the chain of custody.

Using Evidence Bags Effectively

Evidence bags are the dot connectors in an investigation. They act as shields against external factors that could compromise the integrity of the evidence. For instance, biological samples like blood or hair must be kept in a sealed, tamper-evident bag to avoid contamination.

All the evidence bags must be well labeled with the name of the case, crime scene location, and evidence collection date. Such labeling helps in the traceability of evidence, bringing clarity to the process.

tamper-evident bag

Evidence creates a line of custody, which is very important in the course of a trial. Evidence bags prevent unauthorised access and switching by recording every person who will touch the evidence. This rigorous account enhances the credibility of the materials presented as evidence.

After the evidence bags are sealed, they should be put away in a locked place like the evidence room or cabinet. Most law enforcement and forensic laboratories put strict access controls in place to prevent attempts to alter any evidence stored.

These measures preserve the evidence until the time of identification, assessment, or use in a trial. However, to attain the best positive outcomes when using the evidence bags, it is always advisable to use them in combination with other best practices that include proper techniques of evidence collection and documentation

Combined, these steps ensure that any evidence produced holds value to be used in a legal proceeding and ensures justice.

FAQS

Why shouldn’t biological evidence be packaged in plastic?

Biological evidence cannot be kept in plastic because it absorbs moisture and causes mold to grow. This degrades the evidence and makes it impossible to use for DNA testing. 

How to package Fingerprint evidence?

To package fingerprint evidence, use non-porous surfaces like fingerprint cards or envelopes. Avoid touching the evidence directly; use gloves or tweezers. Secure items in labeled, airtight containers to prevent contamination or smudging and maintain a proper chain of custody.

What happens if the chain of custody is broken?

The evidence may be ruled inadmissible in court, weakening the case or even leading to its dismissal.

Conclusion

Preserving evidence is the cornerstone of any effective investigation. Reliable storage solutions play a vital role in maintaining the chain of custody, preventing contamination, and ensuring justice. High-caliber evidence bags safeguard crucial items, protecting them from environmental damage and tampering. 

By using durable, tamper-evident materials, these bags enhance the credibility of collected proof, fostering trust in investigative outcomes.

Law enforcement agencies must prioritize the quality of their evidence storage to uphold the integrity of their cases. Investing in superior evidence bags today strengthens the foundation of tomorrow’s justice. Choose excellence—your cases deserve nothing less. 

Protect What Matters: Invest in Reliable Evidence Bags From Shosky

Searching for tamper-proof evidence bags in bulk? Shosky has you and law enforcement professionals covered! For police officers and legal professionals, our bags are long-lasting and reliable. Reach out to us today to learn about how we can meet your needs and make sure that all evidence is preserved.

Miki Wong
Hey there, I'm Miki Wong, I hope you learn more about our innovation and customer-oriented concept that make our factory an outstanding provider of tamper evident solution.
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