The Bronx district attorney’s office has stopped prosecuting people arrested for trespassing at public housing projects, unless the arresting officer can prove in person that the arrest was warranted, the New York Times reports.

This policy has been in place since July, when prosecutors realized that many people arrested for trespassing were not guilty. Often, police officers wrote statements that said the opposite.

It is the first time that a city district attorney’s office has publicly questioned arrests resulting from stop-and-frisk tactics.