A FEDERAL DRUG AGENT DEMONSTRATES THE USE OF A FULLY AUTOMATIC 9MM COLT SUBMACHINE GUN WEDNESDAY IN A PUBLIC DISPLAY OF THE NEW FIREPOWER AT A PASADENA, CALIF., SHOOTING RANGE. THE DRUG ENFORCEMENT ADMINISTRATION HAS BECOME THE NATION'S FIRST LAW ENFORCEMENT AGENCY TO ISSUE SUBMACHINE GUNS ON A ROUTINE BASIS. THE AGENT IS MASKED TO HIDE HIS IDENTITY.