5 C.F.R. § 9401.105
(a) Prohibited outside practice of law. In addition to the prior approval requirements under § 9401.103 and the outside employment restrictions under § 9401.104, an employee serving in an attorney position shall not engage in the practice of law outside the employee's official Bureau duties that might require the attorney to:
(b) Exemption for self representation. Nothing in this section prevents a Bureau attorney from acting as an agent or attorney for or otherwise representing himself or herself in the outside practice of law, except:
[77 FR 25019, Apr. 27, 2012, as amended at 82 FR 35885, Aug. 2, 2017]