What Is a Chain of Custody DNA Test?

What Is Chain of Custody?

Chain of custody is the documented process that tracks a DNA specimen from the moment it is collected through every transfer until it reaches the testing laboratory. It creates an unbroken record of who handled the specimen, when, and under what conditions.

For legal DNA testing, chain of custody is essential. It provides the documentation that allows a court or government agency to trust that the specimen belongs to the identified person and has not been tampered with or contaminated.

Why Chain of Custody Matters

Without chain of custody, there is no way to verify that a DNA specimen actually belongs to the person it is supposed to belong to. Courts and government agencies require chain of custody to ensure the integrity of the testing process.

If the chain of custody is broken—for example, if a specimen is left unattended or the documentation is incomplete—the results may be challenged or rejected by the court. This is why chain-of-custody procedures must be followed precisely.

Steps in the Chain of Custody Process

• Identity verification: The collector verifies each participant’s government-issued photo ID
• Consent: Each participant signs a consent form agreeing to the collection
• Collection: The collector witnesses the cheek swab collection
• Sealing: Specimens are placed in tamper-evident packaging with seals and signatures
• Labeling: Each specimen is labeled with participant information and a unique identifier
• Documentation: The collector records the date, time, location, and conditions of collection
• Transfer: Specimens are transferred to the laboratory with documented chain of custody
• Laboratory receipt: The laboratory confirms receipt and condition of the specimens

How Mobile Collection Maintains Chain of Custody

The same standards, wherever you are

Mobile DNA collection follows the same chain-of-custody procedures as in-lab collection. The collector verifies identity, witnesses the collection, seals specimens in tamper-evident packaging, and documents every step.

The only difference is the location. Whether the collection happens at your home in Frisco, your attorney’s office in Dallas, or a care facility in Plano, the chain-of-custody procedures are identical.

What Happens If Chain of Custody Is Broken?

If the chain of custody is broken, the DNA test results may be inadmissible in court. A broken chain of custody means there is a gap in the documentation—a period where the specimen’s handling cannot be verified.

This is why it is critical to work with a trained collector who understands chain-of-custody procedures. Begg Mobile Lab’s collectors are trained to maintain unbroken chain of custody from collection through laboratory transfer.

Do You Need Chain of Custody for Your DNA Test?

If your DNA test results will be used in court, for immigration, for child support, or for any legal proceeding, chain of custody is required. If you are testing for personal knowledge only, chain of custody is not necessary.

If you are unsure, contact Begg Mobile Lab or consult with your attorney. We can help you determine whether chain-of-custody procedures are needed for your situation.

Need Mobile DNA Collection in DFW?

Schedule a convenient mobile appointment with Begg Mobile Lab. We come to you throughout the Dallas-Fort Worth Metroplex.

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