Manual of The Mother Church/Church Membership/Probationary Membership
Members who once Withdrew. Section 1. Individuals who have heretofore been members of this Church, or were members of the Church of Christ, Scientist, organized in 1879 by Mary Baker Eddy, but who have voluntarily withdrawn, may be received into this Church on one year's probation, provided they are willing and anxious to live according to its requirements and make application for membership according to its By-Laws. If, at the expiration of said one year, they are found worthy, they shall be received into full membership, but if not found worthy their applications shall be void.
Members once Dismissed. Sect. 2. A full member or a probationary member, who has been excommunicated once, and who afterward, when sufficient time has elapsed thoroughly to test his sincerity, gives due evidence of having genuinely repented and of being radically reformed, shall be eligible to probationary membership upon a unanimous vote of the Christian Science Board of Directors.
Ineligible for Probation. Sect. If a member has been twice notified of his excommunication, he shall not again be received into this Church.