What Is Chain of Custody? Definition, Process & Importance
Chain of custody is the documented, unbroken record of how a sample, piece of evidence, record, photograph, or other potentially relevant material is collected, handled, transferred, stored, and submitted for testing or legal proceedings. It helps establish the identity and integrity of the evidence from the time of collection through its final disposition.
For samples that may be used as forensic evidence, accurate documentation is especially important. The record should identify who collected the sample, when and where it was collected, who handled it, and when custody was transferred.
A witness may also be used to verify the date and time of sample collection. The appropriate documentation should be completed at the time of collection rather than reconstructed later.
When appropriate and permitted, a date- and time-stamped photograph or video taken during sample collection can provide additional documentation of the collection process. Any photographs should respect privacy and applicable laws and should not unnecessarily expose sensitive or intimate areas.
For more information about the legal importance of documenting evidence, read our guide on chain of custody in criminal cases.
What Is a Chain of Custody Form?
A chain of custody form is a document used to create a written record of an evidence sample and the individuals responsible for collecting, handling, transferring, or receiving it.
Depending on the type of sample and testing involved, the form may record information such as:
- The identity of the person who collected the sample
- The date and time of collection
- The identity and signature of witnesses, when applicable
- The identification of each person who handled the sample
- The date and time of each transfer
- How the sample was transferred or delivered
- Information about storage or other handling procedures
- The final recipient or laboratory receiving the sample
This documentation helps establish a clear history of the sample and can help address questions about its identity, handling, and integrity.
Why Is a Chain of Custody Form Important?
A completed form creates a contemporaneous paper trail showing how a sample was handled. This can be particularly important when testing may have legal or investigative implications.
A properly documented record can help answer three fundamental questions:
- Who handled the evidence?
- When and how was it transferred?
- Was the sample properly identified and maintained throughout the process?
The specific documentation required can vary depending on the type of sample, testing method, laboratory, and intended use of the results. If you are preparing a sample for testing, follow the applicable collection and submission requirements carefully.
When Should You Submit a Chain of Custody Form?
A chain of custody form should generally be completed when the sample is collected and submitted for testing, particularly when you may need documentation of its history for an investigation, dispute, or legal proceeding.
The form should accompany the sample when it is submitted according to the applicable testing and laboratory requirements. Completing the documentation at the time of collection helps reduce the risk of missing information or relying on memory later.
When appropriate, collection documentation may also include photographs or video showing the sample collection process. These records can provide additional context about when and how the sample was collected.
Before submitting a sample, review the applicable sample collection and submission guidelines to make sure the required documentation and materials are included.
Download the Chain of Custody Form
You can download and complete the printable Chain of Custody Form for use with an appropriate test sample.
If you need assistance determining which documentation or testing option is appropriate, The Carlson Company provides forensic laboratory testing services and a range of drug test panels.
Why Is Chain of Custody Important?
The purpose of a chain of custody is to document the history of evidence and help demonstrate that the material being tested or presented is the same material that was originally collected.
An incomplete or inconsistent record can create questions about:
- The identity of the sample
- Who had possession of it
- Whether it was properly stored
- Whether it could have been contaminated or altered
- Whether the evidence can be reliably connected to the original collection
For this reason, careful documentation is an important part of evidence handling. A complete chain of custody does not by itself determine whether evidence will be admitted in court, as admissibility depends on the circumstances and applicable legal requirements.
What Happens If the Chain of Custody Is Broken?
A break in the chain of custody occurs when there is an unexplained gap or inconsistency in the documented history of evidence.
For example, if a record does not show who received a sample after a transfer, questions may arise about what happened to the evidence during that period.
Depending on the circumstances, a break or significant discrepancy may affect the credibility, reliability, or legal use of the evidence. Courts and other decision-makers may consider the nature of the gap, the evidence involved, and whether the identity and integrity of the evidence can otherwise be established.
The best way to reduce these issues is to document each relevant stage of collection, handling, transfer, storage, and submission accurately and promptly.
What Does Chain of Custody Mean in Court?
In a legal context, chain of custody refers to the documented history showing how evidence moved from its original collection through subsequent handling, testing, storage, and presentation.
The documentation is intended to help establish that the evidence presented or tested is connected to the material that was originally collected and that its handling can be accounted for.
The exact legal requirements for establishing a chain of custody vary by jurisdiction and case. A properly completed record can nevertheless provide important supporting documentation when the history of a sample or other evidence needs to be demonstrated.
Chain of Custody and Forensic Testing
Chain of custody is particularly relevant when samples are being submitted for forensic laboratory testing and the results may later be used in an investigation or legal matter.
Depending on the type of evidence, forensic testing may involve biological samples, drugs, unknown substances, toxicology specimens, or other materials requiring laboratory analysis.
Proper collection, identification, packaging, documentation, transportation, and receipt all contribute to maintaining an accurate evidence history.
Frequently Asked Questions
What Is the Purpose of Chain of Custody?
The purpose of chain of custody is to document the history and handling of evidence from collection through transfer, testing, storage, and final disposition. It helps establish the identity and integrity of the evidence and provides a record of who handled it and when.
What Are the 4 Elements of Chain of Custody?
The key elements generally include identifying the evidence, documenting who handled it, recording each transfer, and maintaining appropriate storage and handling records. The exact requirements can vary depending on the type of evidence, testing, and applicable procedures.
What Happens If Chain of Custody Is Broken?
If the chain of custody contains an unexplained gap or inconsistency, questions may arise about the identity, integrity, handling, or authenticity of the evidence. Depending on the circumstances and applicable law, this may affect how the evidence is evaluated or used in a legal proceeding.
What Information Should Be Included on a Chain of Custody Form?
A chain of custody form typically records the sample or evidence identification, collection date and time, collector’s information, transfers between individuals, dates and times of transfers, signatures or acknowledgments, and relevant handling or storage information.
Why Is Chain of Custody Important in Court?
Chain of custody documentation can help establish a traceable history of evidence and demonstrate that the material tested or presented is connected to the material originally collected. Its legal significance depends on the facts of the case and the applicable rules and requirements.
Forensic Testing Services From The Carlson Company
Maintaining accurate documentation is an important part of responsible evidence handling. When samples require laboratory analysis, choosing an appropriate testing service and following the required collection and submission procedures can help preserve a clear record of the sample.
The Carlson Company offers a range of forensic and analytical services, including:
- Poisons and Toxins Testing
- Postmortem Toxicology Consulting Services
- Postmortem Forensic Toxicology Testing
- Forensic DNA Testing
- Date Rape Drug Testing
- Unknown Substance Analysis
- Comprehensive Substance Identification
- GC-MS Testing Services
For questions about sample collection, submission, or available testing services, contact The Carlson Company for guidance based on your testing needs.
