A series of revelations in recent months have highlighted a pattern of misuse by US Customs and Border Protection (CBP) of data about travelers and their activities.

Information obtained without a warrant or probable cause under a under a variety of exceptions to the Fourth Amendment (including administrative searches and mug shots at airports, border searches, and “consent” to collection of location information by private third parties) has been aggregated, indexed, and made available for search and retrieval by other CBP staff, other law enforcement agencies, and foreign governments.

Use of the fruit of this surveillance of travelers hasn’t been limited to the government agency that first obtained it from travelers or commercial third parties, or to the purpose that purportedly allowed CBP to obtain it without warrant or probable cause. No access logs are maintained for some of these databases of travel surveillance data, so it’s impossible to audit how they have been used.

Here’s some of what CBP has been up to with its travel surveillance databases:

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