The liability of each defendant is several only and is not joint, except that a party is responsible for the fault of another person. (SECOND) OF TORTS § 286 (1965) (quoted in part in Good). 2.Do Not Use "At Fault" in This Instruction: Do not replace "negligent" with "at fault. Being considered negligent in Arizona is quiet common. So, what does negligence mean in Arizona? Arizona is a state that follows the at-fault based system. Arizona and other at-fault states use the tort liability system to settle damages. If someone injures or otherwise harms you on purpose, you may be able to file an intentional tort claim against them for money damages. Arizona is not a no fault state. Arizona's fault insurance law uses a tortbased system to determine liability for an auto accident.