And unless you can prove an illegal motive, you cannot sue, no matter how unjust or arbitrary your firing. In order to walk away with a successful wrongful termination investigation or lawsuit, you'll need to prove that the employer acted with an illegal motive.How Do I File a Wrongful Termination Claim in Arizona? Legal Protections During Termination in Arizona. Before you file a civil suit against your employer for wrongful termination, you'll need to file a formal complaint with the appropriate government agency. Generally speaking, a claim for wrongful termination generally has either a one or two year statute of limitations in California. The Arizona Employment Protection Act is an exception to "employment-at-will. " This law prevents an employer from firing an employee for certain reason. Is it possible to sue an employer for wrongful termination if they did not provide valid reasons or violate any laws during the firing process? The other broad category for wrongful termination is retaliation.