HYDERABAD: The A.P. Teachers’ Federation on Sunday demanded clear guidelines on identification of fake certificates to facilitate promotion of teachers. K. Venugopal, president, and S. K. Zilani, general secretary, in a statement here said fresh guidelines were necessary as the department officials were unable to take appropriate decisions following orders to revert 3,125 teachers to the secondary grade. They wanted a uniform policy based on the supporting documents applicable for entire State to identify fake certificates.