California enacted Code of Civil Procedure § 425.16 in 1992, a statute intended to prevent the misuse of litigation in certain lawsuits--SLAPP suits (Strategic Lawsuit Against Public Participation). It provides for a special motion which a defendant can file at the outset of a lawsuit to strike a complaint where the complaint arises from conduct that falls within the rights of petition or free speech. The statute expressly applies to any writing or speech made in in a public forum about an issue of public interest and to any other petition or speech conduct about an issue of public interest.
The filing of an anti-SLAPP motion by a defendant prevents the plaintiff from amending the complaint and stays all discovery. If the special motion is denied, the filing of an appeal immediately stays the trial court proceedings as to each challenged cause of action. Defendants prevailing on an anti-SLAPP motion (including any subsequent appeal) are entitled to a mandatory award of reasonable attorney’s fees. More than 200 published court opinions have interpreted and applied California's anti-SLAPP law.
Most defendants are easily able to find high-quality attorneys to represent them since they can be reasonably assured that their fees will be paid by the plaintiff.
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And in one case, even the attorneys representing the plaintiff in such a case lost big-time: