Like a cockpit, an air traffic control facility should be a sterile environment that requires authorization for entry. Once there are authorized visitors in a facility, every effort should be made to ensure that the visit in no way interfere with the operations. Allowing the visitors to utilize the air-ground frequency is an act of irresponsibility and unprofessionalism. It should be noted here that only licensed personnel should be allowed to carry out such tasks. Air traffic control assistants in the facility at which I work are not even allowed that privilege. Serious discipline should be in order for this incident, and controllers everywhere should learn from this case.