Omnibus Election Code
Section 208. Marked ballots. - The board of election inspectors shall then unfold the ballots and determine whether there are any marked ballots, and, if any be found, they shall be placed in an envelope labelled "marked ballots" which shall be sealed and signed by the members of the board of election inspectors and placed in the compartment for valid ballots and shall not be counted. A majority vote of the board of election inspectors shall be sufficient to determine whether any ballot is marked or not. Non-official ballots which the board of election inspectors may find, except those which have been used as emergency ballots, shall be considered as marked ballots.