The US Department of Homeland Security, especially the US Customs and Border Protection, has expanded its Biometric Exit programme beyond fingerprints and document review it has previously used to identify those entering and leaving the country, towards facial recognition.

The process involves taking a picture of a face and cross-checking it against facial templates from visa and passport images already on file, giving rise to concerns around civil rights and surveillance implications. Permission has been given for this when monitoring foreign nationals but not for US citizens.

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