A key government witness lied to the grand jury that indicted several attorneys on charges they conspired to bribe a state judge, one of the accused lawyers claims in court papers filed Monday.

Zach Scruggs, an Oxford, Miss.-based attorney whose well-known father and law partner also faces a bribery charge in the same case, is asking a federal judge to dismiss his indictment due to alleged government misconduct.

Scruggs’ lawyers claim grand jurors heard false and misleading testimony from an FBI agent and from former attorney Timothy Balducci, who already has pleaded guilty to conspiring with Scruggs and others to bribe state Circuit Judge Henry Lackey.

Zach Scruggs’ indictment is a product of their “patently false and misleading” testimony, his lawyers argue.

“It has been clear since the filing of this indictment that the government has no credible evidence that (Zach Scruggs) knowingly participated in any scheme to bribe a judge,” the defense lawyers wrote.

U.S. Attorney Jim Greenlee didn’t immediately return a call for comment Monday. Balducci has represented himself in the criminal matter. His office number has been disconnected.

A trial for prominent plaintiffs lawyer Richard “Dickie” Scruggs; his son, Zach; and fellow Scruggs Law Firm attorney Sidney Backstrom is scheduled to start March 31 in Oxford.

Richard Scruggs, a brother-in-law of former U.S. Sen. Trent Lott, R-Miss., made tens of millions of dollars from tobacco and asbestos litigation. His role in a landmark settlement with tobacco companies was depicted in the 1999 film “The Insider,” starring Al Pacino and Russell Crowe.

Last week, U.S. District Judge Neal Biggers Jr. rejected a different motion by all three defendants to dismiss the charges based on the government’s “outrageous conduct.” However, Zach Scruggs’ attorneys didn’t see transcripts of grand jury proceedings until last week.

Zach Scruggs claims the transcripts, when compared to wiretap evidence, show that Balducci lied to the grand jury and mischaracterized Scruggs’ knowledge of and participation in the alleged conspiracy.

Prosecutors claim Balducci was acting on Richard Scruggs’ behalf when he allegedly tried to bribe Lackey for a favorable ruling in a dispute with other lawyers over $26.5 million in fees from a mass settlement of Hurricane Katrina insurance lawsuits.

The FBI arrested Balducci on Nov. 1 and sent him into the Scruggs Law Firm wearing a body wire. Balducci later testified that he met with Zach Scruggs and Backstrom that day and told them that Lackey wanted $10,000 for the favorable ruling.

However, Zach Scruggs’ lawyers say a recording of that Nov. 1 conversation shows that Balducci used confusing, coded language while their client “only participated in an ordinary conversation about how a judge’s order reads.”

Zach Scruggs’ lawyers also accuse FBI Special Agent William Delaney of giving grand jurors a misleading account of taped conversations between the suspects in the case.

“The Government seeks to convict (Scruggs) on coded words uttered after he is disengaged from a conversation and on actions perceived through a presumptuous lens; yet they indicted a man relying on testimony they knew was facially false and wholly inaccurate,” they wrote.