A Practice Note describing the voluntary Customs Trade Partnership Against Terrorism (CTPAT) program as it relates to US importers. This Note discusses the eligibility requirements and minimum security criteria (MSC) that importers must meet to be certified as a member of CTPAT by US Customs and Border Protection (CBP) and the benefits that importers may receive from CBP in return for their implementation of measures to maintain the security of their international supply chain. The Note also discusses CTPAT Trade Compliance, which is a separate, voluntary component of CTPAT that allows certain CTPAT-certified importers to self-assess and monitor their compliance with CBP laws and regulations in return for various additional benefits beyond those available to CTPAT security partners.