Texas Election Code - ELEC § 141.065. Affidavit of Circulator

(a) Each part of a petition must include an affidavit of the person who circulated it, executed before a person authorized to administer oaths in this state, stating that the person:

(b) If a petition contains an affidavit that complies with Subsection (a), for the purpose of determining whether the petition contains a sufficient number of valid signatures, the authority with whom the candidate's application is filed may treat as valid each signature to which the affidavit applies, without further verification, unless proven otherwise.

(c) A single notarized affidavit by any person who obtained signatures is valid for all signatures gathered by the person if the date of notarization is on or after the date of the last signature obtained by the person.