Each Public Defender shall devote his full time to the discharge of his duties as such and shall not directly or indirectly engage in the private practice of law, nor shall he directly or indirectly refer any legal matter or civil or criminal litigation to any particular lawyer or lawyers or directly or indirectly recommend or suggest to any person the employment of a particular lawyer or lawyers to counsel, conduct, defend, or prosecute any legal matter or litigation when such action would conflict with his duties as Public Defender.