Is it permissible to use a falsified government employment ID to obtain half-price train tickets?

As long as the state does not permit half-fare tickets except for a specific category, this must be adhered to, and it is forbidden to circumvent it, because doing so constitutes consuming public funds unjustly. Justifying circumvention by claiming one is attaining a right is incorrect, because the state has the authority to grant specific privileges to a certain group that it does not grant to others, in order to achieve a recognized public interest.