January 3, 2000
18 U.S.C. § 205(a)(2), which bars a Federal employee from acting as an agent or attorney before any "agency . . . in connection with any covered matter in which the U.S. is a party or has a direct and substantial interest," applies only to Federal agencies and does not apply to state agencies or agencies of the District of Columbia.
https://www.justice.gov/file/19446/download