Right to work checks A correctly conducted right to work check can provide an employer with a statutory excuse against a civil penalty for employing a person illegally, should it be that the employee in question does not have, or loses, the right to work at some point during the employment. To obtain the excuse, the employer must show that it has taken particular steps during the right to work check. Whatever the circumstances of the worker’s illegality a valid right to work check will, with one important exception, act as a statutory excuse for the employer against a civil penalty. The sole exception to this is where the employer has had knowledge ‘at any time during the period of employment’ that the employment was unlawful. The use of the phrase ‘at any time’ suggests