On November 26, 2012, the California Supreme Court overturned an appeals court decision that had threatened to expose juries to unreliable “expert” testimony in support of massively inflated damage claims. The Court ruled that trial courts have an important “gatekeeping” responsibility and must exclude proposed expert testimony not shown to be reliable. The decision was a victory for WLF, which filed a brief urging reversal of the appeals court decision. WLF argued that trial courts should exclude from evidence all proffered expert testimony that does not employ a methodology that is generally accepted among experts in the field. The case involved a dentist who asserted that his dental implant firm would have earned billions of dollars in profits if the defendant had not breached its contract with the firm. The court agreed with WLF that the trial court properly excluded the testimony of plaintiff’s expert, whose massive lost-profit calculations were based on pure speculation.