Paul Ceglia, who says a contract and emails entitle him to half of Facebook, has cleared a polygraph examination conducted to determine the veracity of the alleged contract with the online social network's founder, Mark Zuckerberg, his lawyers said in a court filing.

The polygraph test results, which were filed with the U.S. District Court in Buffalo, New York, on Friday, are part of Ceglia's opposition to Facebook's request that he immediately turn over the alleged original contract and emails for inspection, without being asked to reciprocate.

Ceglia's lawyers contend that the lie-detector testing proves that the agreement and emails are authentic and asked the court to allow both sides to inspect the evidence, instead of granting Facebook's request that only it should be allowed to do so.

Ceglia's lawsuit is a shell game, shifting and changing with every filing, said Orin Snyder a partner in the law firm of Gibson Dunn, which represents Mark Zuckerberg and Facebook.

This latest court filing admits that the bogus emails are, literally, a cut-and-paste job, just like the so-called contract is a fraud.

Ceglia, a wood pellet salesman from Wellsville, New York, is trying to show he contracted in 2003 for 50 percent of Zuckerberg's interest in what became Facebook.

In his amended complaint filed on April 11, Ceglia had discussed the alleged Facebook contract and emails from 2003 and 2004.

The case is Ceglia v. Zuckerberg et al, U.S. District Court, Western District of New York, No. 10-00569.

(Reporting by Abhiram Nandakumar in Bangalore; Editing by Gary Hill and Carol Bishopric)

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