In Arizona, fault in a car accident is determined based on negligence laws. The state follows a “comparative negligence” system, meaning each party involved can be assigned a percentage of fault. To establish fault, insurance companies and legal professionals will gather evidence such as police reports, witness statements, and accident scene photos. It’s crucial to document everything and consult with an experienced attorney to ensure a fair assessment. Understanding Arizona’s fault determination process can help protect your rights and ensure you receive appropriate compensation.