Scott Peterson's lawyer is seeking a mistrial or the dismissal of all charges against the accused wife-killer.
Mark Geragos told the judge Wednesday that a Modesto, California, police detective lied on the stand about the details of a conversation he'd had with an alleged tipster.
Detective Allen Brocchini testified that a tipster had claimed Peterson described to him how he would dump a dead body.
The detective said Peterson allegedly told the tipster he would "tie a bag around the neck with duct tape."
But a source who has heard a tape of Brocchini's phone interview with the tipster tells The Associated Press that the man never mentioned duct tape.
Geragos says there's been a pattern of misconduct by prosecutors in the case.