D.C. Mun. Regs. tit. 6, r. 6-B511
To be eligible to vote in an election, an employee must have been employed in the bargaining unit during the pay period before the date on which the Board ordered the election or as otherwise determined by the Board or consented to by the parties and must still be employed in the bargaining unit on the date of the election.
The employer must file with the Board and the labor organization(s) a list of employees eligible to vote in the election no later than seven (7) days after approval of an election agreement or seven (7) days after the Board or the Executive Director has directed an election, whichever occurs first. Such list must also include the home addresses of the eligible employees.
To be eligible to vote in a runoff election, an employee must have been eligible to vote in the original election and still be employed in the bargaining unit on the date of the runoff.
The agent of the Board agent or other impartial body or any authorized observer may challenge the eligibility of any voter and in so doing must state the reason for the challenge. A voter whose identity has been challenged may establish identity by showing any piece of identification acceptable to the agent of the Board or other impartial body.
An individual whose eligibility to vote is in dispute will be given the opportunity to vote a challenged ballot. If the parties and the agent of the Board or other impartial body are unable to resolve the challenged ballot(s) before the tally of ballots, the agent of the Board or other impartial body will impound and preserve the unresolved challenged ballot(s) until the Executive Director or the Board makes a determination regarding the eligibility of the voter.
A challenged ballot must be placed in a "challenged ballot" envelope. The envelope must be sealed by the agent of the Board or other impartial body and initialed by the observers. The agent of the Board or other impartial body must write the reason for the challenge and the voter's name on the envelope and place the envelope in the ballot box.
The agent of the Board or other impartial body should attempt to resolve ballot challenges to the satisfaction of both parties before the ballots are counted.
D.C. Mun. Regs. tit. 6, r. 6-B511