California is an at will employment state which allows employers to terminate employees for just about any reason that is not motivated by discrimination against a protected class or retaliation for engaging in a protected activity. One of the few exceptions to at will employment is if there is a specific employment contract or collective bargaining agreement in place that states the employee can only be terminated ‘for cause’. This means that they can only be fired if they did something wrong. Making false accusations about coworkers or employers would be a valid cause for firing an employee in most cases.