The Secret Service paid for a product that gives the agency access to location data generated by ordinary apps installed on peoples' smartphones, an internal Secret Service document confirms.

The sale highlights the issue of law enforcement agencies buying information, and in particular location data, that they would ordinarily need a warrant or court order to obtain. This contract relates to the sale of Locate X, a product from a company called Babel Street.

Do you work at Babel Street or Venntel? Did you used to? Do you know anything else about the sale of location data? We'd love to hear from you. Using a non-work phone or computer, you can contact Joseph Cox securely on Signal on +44 20 8133 5190, Wickr on josephcox, OTR chat on jfcox@jabber.ccc.de, or email joseph.cox@vice.com.