Hearings need not be conducted according to technical rules relating to evidence and
witnesses. Oral evidence shall be taken only on oath or affirmation, and each party
shall have the right to call and examine witnesses, to introduce exhibits, to cross-examine
opposing witnesses on any matter relevant to the issues even though the matter was
not covered in the direct examination, to impeach any witness regardless of which
party called him to testify, and to rebut the evidence against him. If respondent
does not testify in his own behalf, he may be called and examined as if under cross-examination.
The rules of privilege shall be effective to the same extent that they are now or
hereafter may be recognized in civil actions. Irrelevant and unduly repetitious evidence
shall be excluded.
