explanation, but the tradition has been changed by the Supreme Court where the reason for the peremptory challenge was the race of the potential juror. Since the 1970s "scientific jury selection" has become popular. Unanimous jury verdicts have been standard in US American law. This requirement was upheld by the Supreme Court in 1897, but the standard was relaxed in 1972 in two criminal cases. As of 1999 over thirty states had laws allowing less than unanimity in civil cases, but, until 2020, Oregon and Louisiana were the only states which have laws allowing less than unanimous jury verdicts for criminal cases (these laws were overturned in Ramos v. Louisiana). When the required number of jurors cannot agree on a verdict (a situation sometimes referred to as a hung jury), a mistrial is declared, and the case may be retried with a newly constituted jury. The practice generally was that the jury rules only on questions of fact and guilt; setting the penalty was reserved for the judge. This practice was confirmed by rulings of the U.S. Supreme Court such as in Ring v. Arizona, which found Arizona's practice of having the judge decide whether aggravating factors exist to make a defendant eligible for the death penalty, to be unconstitutional, and reserving the determination of whether the aggravating factors exist to be decided by the jury. However, in some states (such as Alabama and Florida), the ultimate decision on the punishment is made by the judge, and the jury gives only a non-binding recommendation. The judge can impose the death penalty even if the jury recommends life without parole. There is no set format for jury deliberations, and the jury takes a period of time to settle into discussing the evidence and deciding on guilt and any other facts the judge instructs them to determine. Deliberation is done by the jury only, with none of the lawyers, the judge, or the defendant present. The first step will typically be to find out the initial feeling or reaction of the jurors to the case, which may be by a show of hands, or via secret ballot. The jury will then attempt to arrive at a consensus verdict. The discussion usually helps to identify jurors' views to see whether a consensus will emerge as well as areas that bear further discussion. Points often arise that were not specifically discussed during the trial.