article_snippet.sent: This 1999 file photo shows an Arizona correctional officer explaining Oklahoma's execution method .
article_snippet.sent: Executions in Oklahoma are currently on hold while the Supreme Court ponders whether the three-drug mix now favored by Oklahoma is constitutional.
article_snippet.sent: The new bill, effective from November 2015, moves the electric chair back from second preference to third, while firing squad becomes a distant fourth choice if all other methods are unavailable.
article_snippet.sent: The changes come after a botched execution last year in which Oklahoma was using a new sedative as the first in a three-drug combination.
article_snippet.sent: The problematic execution was blamed on a poorly placed intravenous line and prompted a lawsuit from Oklahoma death row inmates, who argue that the state's new drug combination presents a serious risk of pain and suffering.
article_snippet.sent: The U.S. Supreme Court is scheduled to hear arguments later this month.
article_snippet.sent: Utah brought back the firing squad earlier this year in response to a drugs shortage, while Tennessee reinstated the electric chair.
highlights_snippet.sent: Method will become Oklahoma's second choice after lethal injection .
  
highlights_snippet.sent: Supreme Court is due to rule on whether current execution drugs are legal .
  