Kentucky officials say the state is ready to resume executions with new rules that change the drug concoction used in lethal injections.

The Kentucky attorney general's office told Franklin Circuit Judge Phillip Shepherd in documents filed Friday that the new method uses one or two drugs instead of three. That new method also addresses legal challenges raised by inmates.

Shepherd had stopped executions in 2010 and ordered officials to switch to a single-drug or two-drug method. The state's latest filing asks him to lift the order.

Defense attorneys say the new execution rules that took effect Friday only end the argument over the validity of the state's former lethal injection procedure.

Also Friday, inmate Greg Wilson, whose mental health claims led Shepherd to halt executions, gave notice that he is withdrawing his challenge.