(a) While on Government-owned or leased property or on duty for the Government, an employee shall not conduct or participate in any gambling activity, including operating a gambling device, conducting a lottery or pool, participating in a game for money or property, or selling or purchasing a numbers slip or ticket.

(b) This section does not preclude activities:   (1) Necessitated by an employee's official duties; or   (2) Occurring under section 7 of Executive Order 12353 and similar agency-approved activities.