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Mel Gibson hired private investigators to visit key witnesses in an attempt to discredit former girlfriend Oksana Grigorieva’s abuse claims, reports say.

Radar Online says PIs visited at least two witnesses poised to provide evidence against Mel, who stands accused of battering Oksana on January 6.

Oksana has told police, who are investigating Gibson, that he punched her twice in the face, leaving her with two broken teeth and a concussion.

One of the witnesses visited by Mel’s private eyes was her dentist, Dr. Ross Sheldon, whose accounts of the injuries Oksana suffered have varied.

“This calculated ploy explains the conflicting stories the dentist supposedly made about injuries Oksana suffered at the hands of Mel,” said a source.

Despite his apparent conflicting stories, Dr. Sheldon says willing to go on record stating that Oksana did indeed suffer a major blow to her mouth.

He’s got issues, but did Mel Gibson abuse ex-girlfriend Oksana Grigorieva?

Meanwhile, Mel’s alleged flurry of punches January 6 was not the first instance of domestic violence, his ex-lover has now claimed to authorities.

Grigorieva says the rage-filled superstar first assaulted her in November 2009. Just a few weeks after she gave birth to their daughter Lucia.

“Oksana said Mel got right up in her face during a confrontation and was screaming and berating her,” said a source familiar with the investigation.

She told law enforcement Mel was so worked up, he was literally frothing at the mouth as he spewed hatred and even spat saliva in her face.

It’s a vision we can easily picture after listening to the Mel Gibson rants – phone calls she recorded with the out-of-control actor February 18.

“Oksana said Mel pushed her on the shoulder and butted her with his chest,” said the source. “Oksana claimed Mel pushed her a number of times.”

The L.A. County Sheriff’s Department will turn over the case to the D.A.’s office, which will decide whether to file charges, in about two weeks.