D.C. Code § 2-223.05: Election of remedies.

(a)

The institution of a civil action pursuant to § 2-223.03(a) shall preclude an employee from pursuing any administrative remedy for the same cause of action from an arbitrator pursuant to a negotiated grievance and arbitration procedure or an employment contract.

(b)

No civil action shall be brought, pursuant to § 2-223.03(a) if the aggrieved employee has had a final determination on the same cause of action from an arbitrator pursuant to a negotiated grievance and arbitration procedure or an employment contract.