Modifies provisions relating to determinations of fault in tort actions

SB 1513 modifies how fault is assigned in personal injury and property damage lawsuits (tort actions) by shifting to a proportional liability system. It states that if a defendant is found 51% or more at fault, they pay the full judgment; otherwise, they pay only their percentage of fault. If a plaintiff is 51% or more at fault, they cannot recover any damages. The bill requires courts to calculate damages based on each party's fault percentage and instruct juries on these rules, while preventing disclosure of the law's impact to jurors. This directly affects plaintiffs, defendants, and courts handling tort cases in Missouri.