In the realm of crime scene investigations (CSI), the integrity of evidence is paramount. The chain of custody must be preserved, and any tampering with evidence can have far-reaching consequences in the pursuit of justice. This is where the importance of tamper-evident features in CSI evidence bags becomes evident. In this article, we will delve into why these features are essential in preserving the credibility and reliability of forensic evidence.

Maintaining the Chain of Custody

The chain of custody refers to the chronological documentation and tracking of physical evidence from its collection at the crime scene to its presentation in court. It is a foundational principle in criminal law and serves to establish the authenticity and integrity of evidence. Tamper-evident features play a crucial role in preserving this chain of custody:

  1. Dissuading Unauthorized Access: Tamper-evident features act as a deterrent to unauthorized access. Knowing that evidence bags are designed to reveal any tampering discourages individuals from attempting to compromise the integrity of the evidence.
  2. Immediate Detection of Tampering: If someone does attempt to tamper with an evidence bag, tamper-evident features provide an immediate visual indication of the breach. This allows investigators to take swift action to address the issue and document the incident.

Types of Tamper-Evident Features

CSI evidence bags are equipped with various tamper-evident features to ensure the integrity of evidence is maintained:

  1. Adhesive Seals: Many evidence bags use specialized adhesive seals that securely close the bag. Once the seal is broken, it cannot be resealed without clear evidence of tampering, such as a broken seal or void message.
  2. Security Tape: Some evidence bags incorporate security tape that leaves behind a “void” message or pattern when removed, indicating that the bag has been opened.
  3. Serial Numbers and Barcodes: Each evidence bag may be assigned a unique serial number or barcode. Any tampering with the bag can be detected when the serial number or barcode no longer matches the recorded information.
  4. Dual Pouches: In some cases, evidence bags have dual compartments, with one compartment serving as a receipt or documentation pouch. Tampering with the evidence would require access to both compartments, making it more difficult to conceal.

Preserving Evidence Integrity

The integrity of evidence is crucial in the criminal justice system. Tampering with evidence, whether intentional or accidental, can have severe consequences:

  1. Contamination Risk: Tampering can introduce contaminants or compromise the forensic integrity of biological or physical evidence. This can lead to the exclusion of evidence in court or wrongful convictions.
  2. Loss of Trust: Tampering erodes trust in the criminal justice system. Both the prosecution and defense rely on the unimpeachable integrity of evidence to ensure fair trials.
  3. Legal Consequences: Tampering with evidence is a criminal offense and can result in severe legal penalties for those involved.


In the world of crime scene investigations, where the stakes are high and justice hangs in the balance, the importance of tamper-evident features in CSI evidence bags cannot be overstated. These features are not mere security measures; they are safeguards of truth and fairness in the legal system. By providing a clear indication of any tampering, they ensure that the chain of custody remains intact, preserving the credibility and reliability of forensic evidence and upholding the principles of justice.

Comments are closed.