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Pursuant to a congressional request, GAO reviewed the design and implementation of the Customs Service's Self-Inspection Program (SIP), focusing on: (1) SIP's principal features; (2) the basis for Customs' design for SIP; (3) how SIP differs from Customs' previous management inspection program; and (4) SIP design issues identified by Customs to date and what Customs is doing to respond to them.

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