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American National Standard for Due Diligence in Procuring/Sourcing Legal Timber. This consensus voluntary Standard serves to document a common understanding of the most suitable internal due diligence quality assurance program for establishing confidence that illegal timber is excluded from the timber supply chain. Entities may choose to self-certify or to engage a third party, with or without ISO/IEC 17065 or ISO/IEC 17021 credentials, to perform an independent audit against the requirements of this Standard.