Labor Code § 3600(a)(7) establishes the initial physical aggressor defense. It explains that a claim is not compensable when the injury arises "out of an altercation in which the injured employee is the initial physical aggressor." That defense embodies the legislative intent to exclude from compensation those who introduce violence into the workplace.
The types of behavior that are barred under the statute were defined in the seminal case of Mathews v. WCAB (1972) 6 Cal. 3d 719, in which the Supreme Court explained that former LC 3600(g), now LC 3600(a)(7), applies when two conditions are present. One, the injury must "arise out of an altercation." Two, the injured employee must be the "initial physical aggressor" in the altercation.