MO HB2777

Prohibits public nuisance claims against the design, manufacturing, distribution, sale, labeling, or marketing of legal products sold in commerce, as well as actions authorized by government permits, licenses, or regulations

Requires plaintiffs to prove both "but-for" and proximate causation with particularity, meaning the nuisance would not exist without defendant's actions or abatement costs would decrease by more than 25%

Limits political subdivisions to bringing claims only for nuisances wholly within their jurisdiction; all other government claims require the Attorney General with written approval from the Governor

Bars courts from awarding any damages (economic, noneconomic, or exemplary) or future abatement costs in government-filed public nuisance actions

Establishes a 3-year statute of limitations from discovery of defendant's conduct and prohibits recovery for conduct occurring more than 10 years before filing; applies to claims brought on or after August 28, 2026