There shall be provided an examining staff qualified to develop and apply, with the advice and cooperation of the members of the several professions and occupations involved, the most effective examining procedures that it is practicable to devise.  The director shall from time to time consult members of the professions and vocations, as individuals and in groups, with reference to professional and vocational standards and other matters affecting the several occupations.  He may appoint from time to time advisory committees from among the members of the several professions and vocations, as he thinks necessary, to advise and assist him and the boards in preparing rules and regulations for approval by the several boards and to assist him and the boards in the preparation, conduct, or rating of examinations.  He may employ temporarily, from time to time, such persons trained in the several professions as are necessary to assist in the preparation, conduct, or rating of examinations.  A single field force organized to cover the state shall be provided to make, so far as practicable, all the inspections and investigations necessary for all the professions and vocations subject to regulations, examining, or licensing by the department, which shall cooperate with the field forces of the departments.