Its a good question why the officers werent charged. It wasnt because of lack of effort.
From the
Wiki page about it:
On May 21, Police Chief Steve Conrad announced his retirement after intense local and national criticism for the department's handling of the case, to be effective June 30.[31] Conrad was fired on June 1 after the fatal shooting of black business owner David McAtee.
Louisville Mayor Greg Fischer indefinitely suspended the use of "no knock" warrants on May 29
The LMPD has also announced on June 10 that it will require all sworn officers to wear body cameras, and will change how it carries out search warrants
All three officers involved in the shooting were placed on administrative reassignment pending the outcome of an investigation by the police department's internal Professional Integrity Unit. On May 20, 2020, the investigation's findings were given to Kentucky Attorney General Daniel Cameron to determine whether any officer should be criminally charged. Louisville Mayor Greg Fischer also asked the FBI and U.S. Attorney's Office to review the findings. The FBI is also conducting its own independent investigation, announced by the Bureau's Louisville field office on May 21.
In early June, Fischer called for Officer Hankison to be removed from the Louisville Police Merit Board, which reviews appeals from police offices in departmental disciplinary matters. Hankison was one of five members of the board, which consists of three civilians and two police officers selected by the River City Fraternal Order of Police. On June 19, three months after Taylor's killing, Louisville Metro Police interim chief Robert Schroeder sent Hankison a letter notifying him that Schroeder had begun termination proceedings against him. The letter accused Hankison of violating departmental policies on the use of deadly force by "wantonly and blindly" firing into Taylor's apartment without determining whether any person presented "an immediate threat" or whether there were "any innocent persons present".[The letter also cited past disciplinary action taken against Hankison by the department, including for reckless conduct. Hankison was formally fired four days later (June 23); he had ten days (until July 3) to appeal his termination to the Louisville Police Merit Board.