Tortious interference with business relations involves a third party using false claims against a business in order to drive business away. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option.Interference can occur when an outside party purposefully leads someone in a business agreement to break the terms of the agreement. The business owner should be able to prevail over the competitor's tortious interference claim based on the First Amendment as truth is a complete defense. You can file a tortious interference lawsuit if a third party disrupts your business contract or hinders your professional relationship. California courts have long recognized causes of action for tortious interference with contract and tortious interference with prospective economic advantage.