Chain of Custody for Environmental Labs: The Form Is Not the Requirement
Under the TNI standard, a legal chain of custody procedure is required only when the customer requires one. Every environmental sample still needs documented receipt criteria, indelible identification, preservation and holding time checks, and a unique identifier that links the result back to the person who received it.
Laboratories must be able to reconstruct what happened to a specific sample, from the report back to receipt. Understanding custody records, documentation requirements, and what assessors look for helps laboratories identify gaps, demonstrate compliance, and protect data integrity.
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