The U.S. Attorney’s Office for the Eastern District of Texas did not engage in misconduct when it opened—and later terminated—an investigation into Lisa Blue, according to a recent letter the U.S. Department of Justice’s Office of Professional Responsibility (OPR) sent to the Dallas trial lawyer.

The Sept. 26 letter from OPR—a branch of the DOJ charged with policing misconduct complaints lodged against federal prosecutors—noted that Blue alleged that the U.S. attorney’s office had begun an investigation into her without cause and committed misconduct during the probe. The investigation concluded after OPR found no evidence of a criminal violation, according to the letter.