Officers were initially accused of a cover-up to protect the Hollywood star, who has previously participated in fundraising appeals for a police charity.
It was alleged local sheriff's deputies tried to conceal Gibson's reported anti-Semitic verbal attack on officer James Mee, who arrested him in Malibu, California.
However, the Office of Independent Review has declared the incident was handled correctly in a preliminary investigation.
The office's Chief Attorney Mike Gennaco admitted the initial report was "modified" by someone at the Los Angeles department's Lost Hills station--but said that did not necessarily indicate wrongdoing.
He also revealed the department would try to find out who leaked the initial police report to the media.
A spokeswoman for the Los Angeles County District Attorney reveals a date for filing formal charges against Gibson has yet to be decided.
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