Question: Does CBP accept isotope testing reports as evidence of origin?
Yes. According to CBP, they accept any information as part of Applicability* review, to include isotope reports. Visit cbp.gov for more information about Best Practices for Applicability Review.
Question: Does CBP provide guidance on isotope testing reports?
Yes. On November 8, 2024, CPB published its guidance on isotope testing. For more information visit cbp.gov.
Question: Does CBP recommend a specific laboratory to conduct isotope testing?
No. U.S. Customs & Border Protection (CBP) cannot recommend specific isotope testing providers.
Question: Does CertainT Isotope Testing meet CBP’s guidance for Isotope Testing? If so, how?
Yes. CertainT Isotope Testing meets CBP’s guidance for isotope testing. Here’s how:
- Follows Forensic Isotope Ratio Mass Spectrometry (FIRMS) Network Good Practice Guide for Isotope Ratio Mass Spectrometry.
- Accredited under the International Organization for Standardization/International Electrotechnical Commission. (ISO/IEC) 17025. Note as we are ISO17025, we do not require accreditation granted by a body that is a signatory to the International Laboratory Accreditation Cooperation-Mutual Recognition Arrangement (ILAC-MRA).
- Participation in regular proficiency testing conducted under ISO 17025 and FIRMS that is equivalent or similar to ISO/IEC 17043 to Conformity Assessment sample provider.
- Able to provide all relevant accreditation certificates and proficiency testing reports to CBP upon request.
- Maintain a detailed chain of custody for any submitted sample, from receipt of the sample through disposition.
