impartial hearing officer

(i) who is not an employee of a public agency (other than an administrative law judge, hearing examiner, or employee of an institution of higher education);

(ii) who is not a member of the State Rehabilitation Council described in section 725 of this title;

(iii) who has not been involved previously in the vocational rehabilitation of the applicant or eligible individual;

(iv) who has knowledge of the delivery of vocational rehabilitation services, the State plan under section 721 of this title, and the Federal and State rules governing the provision of such services and training with respect to the performance of official duties; and

(v) who has no personal or financial interest that would be in conflict with the objectivity of the individual.