What Is Chain of Custody
Chain of custody is the documented record of who collected, handled, transported, and tested a mold sample from the moment it was gathered until lab results were delivered. Every person who touches the sample must sign off on it, note the date and time, and document the sample's condition. This creates an unbroken paper trail that verifies the sample wasn't contaminated, swapped, or lost during the process.
Why It Matters
Mold testing results only mean something if you can prove the sample came from where you think it came from and wasn't compromised along the way. Without proper chain of custody, a lab report claiming you have a serious mold problem becomes legally and medically questionable. If you ever need to pursue insurance claims, take legal action against a landlord, or defend yourself against liability, weak chain of custody undermines your entire case. The EPA and most state health departments expect proper chain of custody for any mold sampling used in remediation decisions or litigation.
The Process
- Collection: A certified inspector takes mold samples using sterile equipment and seals them in tamper-evident containers labeled with the sample location, time, date, and inspector name.
- Transport: Samples are placed in a sealed bag with a chain of custody form documenting who transported them and when. Temperature control matters for some testing methods to prevent sample degradation.
- Lab Receipt: The laboratory logs the samples upon arrival, noting condition and integrity. Any breaks in the seal or missing documentation get flagged immediately.
- Analysis: Lab technicians run Laboratory Analysis on the samples and sign the report, confirming they tested the exact samples received.
- Delivery: Final results include signatures from everyone in the chain, creating a defensible record.
When Testing Matters Most
You need rigorous chain of custody when mold problems affect health decisions or property value. If someone in your household has respiratory issues or asthma, and you suspect mold is the trigger, third-party lab testing with proper chain of custody gives you credible evidence to show a doctor or allergist. Similarly, if you're buying a property and want to verify past remediation work was done correctly, insist on Third-Party Testing from a lab with solid chain of custody practices.
Documentation Requirements
- Chain of custody forms must include sample ID, location within the property, collection date and time, sampler name and credentials, and signature.
- Any transfer between people requires a new entry with date, time, names, and signatures of both parties.
- Lab reports should explicitly state that chain of custody was maintained throughout the process.
- Keep all forms for at least three years, as some insurance and legal proceedings reference past testing years later.
Common Questions
- Do I need chain of custody if I'm just testing my home for peace of mind?
- For personal knowledge, a basic lab analysis is fine. But if you plan to act on the results, sell the home, file an insurance claim, or pursue remediation reimbursement, proper chain of custody protects you legally and medically.
- What happens if chain of custody breaks?
- The sample becomes questionable. A gap in documentation, a missing signature, or a broken seal means the lab can't guarantee the sample wasn't contaminated or switched. Results become unreliable and legally indefensible.
- Does my remediation contractor need to follow chain of custody?
- After remediation work is complete, many contractors perform post-remediation testing to verify moisture control worked and mold levels returned to normal. That testing should follow chain of custody standards so you have proof the work was successful.