The regional board of school trustees shall not act on a petition filed by a board of education if within 45 days after giving the first notice of the hearing required under Section 7-11 of this Code a petition in opposition to the petition of the board to dissolve, signed by a majority of the legal resident voters of the district, is filed with the regional board of school trustees. In such an event, the dissolution petition is dismissed on procedural grounds by operation of law and the regional board of school trustees shall have no further authority to consider the petition. A dissolution petition dismissed as the result of a valid opposition petition is not subject to the limitation on successive petitions as provided in Section 7-8 of this Code, and a new petition may be filed upon receipt of the regional board of school trustees' notice stating that the original petition was dismissed by operation of law.
For all petitions under this Section, the legal resident voters must be determined by the official voter registration lists as of the date the petition is filed. No signatures may be added or withdrawn after the date the petition is filed. The length of time for signatures to be valid, before filing of the petition, may not exceed 6 months. Notwithstanding any provision to the contrary contained in the Election Code, the regional superintendent of schools shall make all determinations regarding the validity of the petition, including, without limitation, signatures on the petition. Any party who is dissatisfied with the determination of the regional superintendent regarding the validity of the petition may appeal the regional superintendent's decision to the regional board of school trustees by motion, and the motion must be heard by the regional board of school trustees prior to any hearing on annexing the territory of a district being dissolved. If no opposition petition is timely filed, the regional board of school trustees shall have no authority to deny dissolution requested in a proper petition for dissolution filed under this Section , but shall exercise its discretion in accordance with Section 7-11 of this Code on the issue of annexing the territory of a district being dissolved, giving consideration to but not being bound by the wishes expressed by the residents of the various school districts that may be affected by such annexation.
105 ILCS 5/7-2a