Oklahoma constitution
Article X: revenue and taxation
Section 6

B. The board of county commissioners of any county may call a special election to determine whether or not household goods of the heads of families and livestock employed in support of the family located within the county shall be exempt from ad valorem taxation. Such an election shall also be called by the board upon petition signed by not less than twenty-five percent (25%) of the registered voters of the county. Upon passage of the question, the exemption provided for in this subsection shall become effective on January 1 of the following year.