(a) The commissioners court of a county may purchase poisons and related accessories required by citizens of the county to destroy prairie dogs, wildcats, gophers, ground squirrels, wolves, coyotes, rats, English sparrows, and ravens.
(b) The commissioners court may furnish the poison to citizens of the county free or at cost.
(c) The commissioners court shall pay for the poison from the general fund of the county and shall deposit the proceeds of any sale to the credit of that fund.