The Trump administration used an early, unreported program to separate migrant families along a remote stretch of the border

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MEXICO CITY — The Trump administration began separating migrant families along a remote stretch of the U.S.-Mexico border months earlier than has been previously reported — part of a little known program coming into view only now as the Biden administration examines government data.

In May 2017, Border Patrol agents in Yuma, Ariz., began implementing a program known as the Criminal Consequence Initiative, which allowed for the prosecution of first-time border crossers, including parents who entered the United States with their children and were separated from them.

From July 1 to Dec. 31, 2017, 234 families were separated in Yuma, according to newly released data from the Department of Homeland Security, almost exactly the same number as were separated in a now well known pilot program in El Paso that year. Because the Yuma program began in May, and the existing data on family separations begins only in July, the number of separations there was likely higher than 234, a prospect the Biden administration is now investigating.