; unless one of the pieces of information matched includes a signature, photograph, or unique identifying number ensuring that the information from each source refers to the same individual. (b) Prohibition Against Voter Caging No State or local election official shall prevent an individual from registering or voting in any election for Federal office, or permit in connection with any election for Federal office a formal challenge under State law to an individual’s registration status or eligibility to vote, if the basis for such decision is evidence consisting of— (1) a voter caging document or voter caging list; (2) an unverified match list; (3) an error or omission on any record or paper relating to any application, registration, or other act requisite to voting, if such error or omission is not material to an individual’s eligibility to vote under section 2004(a)(2)(B) of the Revised Statutes ( 52 U.S.C. 10101(a)(2)(B) ); or (4) any other evidence so designated for purposes of this section by the Election Assistance Commission, except that the election official may use such evidence if it is corroborated by independent evidence of the individual’s ineligibility to register or vote. (c) Requirements for Challenges by Persons Other Than Election Officials (1) Requirements for challenges No person, other than a State or local election official, shall submit a formal challenge to an individual’s eligibility to register to vote in an election for Federal office or to vote in an election for Federal office unless that challenge is supported by personal knowledge regarding the grounds for ineligibility which is— (A) documented in writing