Customs and Border Protection's Implementation of the Western Hemisphere Travel Initiative at Land Ports of Entry [open pdf - 2MB]
This Department of Homeland Security (DHS) Office of Inspector General (OIG) report "addresses Customs and Border Protection's [CBP] implementation of the Western Hemisphere Travel Initiative [WHTI] at land ports of entry and actions needed to be better prepared to fully enforce the new document requirement. It is based on interviews with employees and officials of relevant agencies and institutions, direct observations, and a review of applicable documents." According to the audit, "CBP is not prepared to fully enforce the WHTI document requirement at land ports of entry" and it has "also has not finalized the operating procedures its officers will use to process noncompliant travelers under full enforcement including the conditions requiring travelers be sent to secondary inspection areas, and the minimum inspection requirements and detailed steps needed to verify a noncompliant traveler's identity and citizenship."
Department of Homeland Security, Office of Inspector General, Report No. OIG-11-16
United States Department of Homeland Security, Office of Inspector General: http://www.dhs.gov/xoig/