The holders of public facilities and/or private establishments may request, in the exercise of their function of monitoring compliance with the measure adopted by the health authorities consisting of the mandatory use of the mask in any closed space for public use or that is open to the public, the documentation that certifies the concurrence of any of the causes of exemption from the obligation to wear a mask to those who access it without a mask. Not allowing entry to establishments open to the public to those that are applicable to the provisions of Law 11/2009 to those people who refuse to show this documentation on the basis of the right of admission cannot be understood as discrimination, since they are obliged to comply with the established requirements and access and admission rules. These include those adopted by the competent health authorities, such as the use of a mask in certain spaces.