Omnibus Election Code
Section 137. Power of the board of election inspectors to administer oaths and issue summons. - For the purpose of determining the right of applicants to be registered as voters in the list, the board of election inspectors shall have the same power to administer oaths, to issue subpoena and subpoena duces tecum and to compel witnesses to appear and testify, but the latter's fees and expenses
incident to the process shall be paid in advance by the party in whose behalf the summons is issued.