All elections by the people are by secret ballot. Generally, election officials are sworn in office the day of the election; one of the judges opens the ballot box publicly, turns it upside down to prove its emptiness, locks it and keeps it locked until the voting polls are closed. At the beginning of the election day, the election judges receive the registration books and the list of those citizens whose past three years poll tax has been paid. The election clerk receives a poll book, a blank book to be used for the official listing of the voters who come to the polls. After all election officials have received their necessary clerical supplies and their instructions, the polls are opened for voting. Thus, a citizen is immediately checked for his proper registration and poll tax payments when he comes to vote. He then receives a ballot which he alone marks secretly in a voting booth. Voting must be performed carefully because a defaced, improperly marked ballot may be challenged and thrown out. He folds his ballot to maintain secrecy and hands it to an election judge who places it immediately in the ballot box. It is illegal for a voter to be approached concerning a possible candidate any nearer than 100 feet from the polling place. Fifteen minutes before closing time for the polling place, one of the election judges will loudly proclaim this fact in front of the polling place. Exactly fifteen minutes later, the voting officially ends and only ballot holders at this time are allowed to cast their vote.