Fifty-five prosecutors and law enforcement officials from across the United States signed a statement supporting Gardner's Brady List. Gardner, in February 2019, announced that the CAO and police department are working together on problems stemming from the list. In January 2019, Gardner's office accused officers within SLMPD of obstructing their investigation in the shooting death of officer Katlyn Alix by officer Nathaniel R. Hendren, one of two officers charged with crimes relating to the incident, which resulted in a sharp rebuke by Chief John Hayden. In 2019, Gardner admitted to repeat campaign finance violations dating back to her time as a Missouri State Legislator. These violations included using campaign donations to pay for a private apartment. Gardner reached an agreement with the Missouri Ethics Commission to pay a settlement of $6,314 in lieu of a $63,009 fine. The Circuit Attorney's Office has experienced a more than 100% turnover rate in staff since Gardner took office. "The St. Louis Post-Dispatch" reported in September 2019 that "over 65 attorneys with a combined experience of over 460 years in prosecutorial experience" have left the Circuit Attorney's office under Gardner. Gardner's office secured a grand jury indictment of sitting Missouri Governor Eric Greitens in February 2018, for felony invasion of privacy. On April 20, 2018, Gardner's office announced a new charge of tampering with computer data against Greitens. The governor was swiftly released on his own recognizance. Then Missouri Attorney General Josh Hawley had opportunity to prosecute but declined to do so. In May 2018, the judge in the Greitens case ruled that the defense could call Gardner as a witness due to suspected criminal conduct by the prosecution. Following the judge's ruling, Gardner's office announced that they would be dismissing the invasion of privacy charge citing that Gardner could not testify in a case her office was prosecuting. Following the Governor's announcement that he planned to resign, Gardner announced that all charges against Greitens would be dropped. On May 15, 2018, Missouri Governor Eric Greitens' attorneys filed a police report with the St. Louis Metropolitan Police Department alleging perjury by William Don Tisaby, an ex-FBI agent and private investigator that Gardner hired to investigate Greitens. Defense attorneys also cited $100,000 in secret cash payments to witnesses, payments they stated were concealed from the defense team by Gardner, as well as numerous meetings between the Circuit Attorney and William Tisaby, and "a major witness in the case". In a statement regarding the police report, defense attorneys said, "By law, both the Circuit Attorney and William Tisaby were required to testify about what was said and done in those secret meetings.