12- 180 C.M.R. ch. 11, § 50
Any prospective voter may be challenged for cause. A challenged voter must be permitted to vote in the following manner: The ballot must be sealed by the challenged voter in an envelope marked only "Secret Ballot." That "Secret Ballot Envelope" must be sealed by the challenged voter in a separate "Challenged Ballot Envelope" on which the voter is identified and the cause of challenge disclosed. The employee shall then report to the Board election agent conducting the election, and must then be allowed to put the "Challenged Ballot Envelope" into the container with the regularly cast ballots. In a mail ballot election, the Board agent shall write on the outer mail envelope the cause of the challenge and set the challenged ballot aside. If the challenged ballots are insufficient in number to affect the result of the election, no determination with respect to them may be made. If the challenged ballots are sufficient in number to affect the result of the election, the executive director shall resolve the challenge. If the executive director concludes that a hearing is necessary to resolve the challenge, the hearing procedures provided in sections 21 to 30 apply.
12- 180 C.M.R. ch. 11, § 50