In order to vote, citizens were required to present a valid "credencial para votar con fotografía" (voter identification card, with photograph). The card was checked against the official voter list for the polling place, which contained facsimiles of each card. The citizen was then given the blank ballots and directed to the booth so he or she could mark them secretly; if a person could not read or was physically impaired, they could be accompanied by a single person they themselves designated. The citizen then folded the ballots, and deposited them in the corresponding ballot boxes. Then, the Secretary of the Directing Committee would write "voted" in the entry corresponding to the citizen in the official voter list, the identification card was marked and returned to the voter, and their right thumb marked with indelible ink (article 218). The party and coalition representatives voted in the booth to which they are assigned, and were logged in special entries in the voter list. During the voting, the party representatives could file complaints in writing, which were received by the Chair and logged by the Secretary (article 221). A specified number of "special voting places" were also installed for people voting outside their polling place. Their thumbs were inspected before allowing them to vote, and the data logged. They were allowed to cast votes in all elections corresponding to both the location of the special voting place and their own registry; for example, if they were voting in their state but outside their district they were allowed to cast votes for senator and president, but not for district deputy (article 223).