Revise legal requirement of standing to maintain a lawsuit

This bill establishes Montana's legal standing requirements for filing lawsuits, ensuring courts only hear cases where plaintiffs have a direct, personal stake in the outcome. It directly affects anyone attempting to bring a legal claim in Montana state courts by clarifying that courts cannot decide cases where the plaintiff lacks standing. The bill defines standing as requiring three elements: a specific, real injury caused by the defendant, a direct link between the injury and the defendant's actions, and the ability for the court to provide meaningful relief. It explicitly states that general grievances as a citizen or taxpayer, speculative harms, or issues of public importance alone are insufficient to create standing. The law applies to all legal proceedings filed on or after July 1, 2025.