The Right Jury Size

More on juries, this time related to the size of juries in the United States. Slate Magazine recently ran an interesting article on jury size noting that all but two states require juries that contain 12 people to give unanimous verdicts. The article runs down nicely how the Supreme Court has ruled in the past regarding jury size:

Isn’t a verdict in a criminal trial supposed to be unanimous? The answer is yes in 48 states and yes if the case is tried in a federal court. But two states, Oregon and Louisiana, allow convictions by a non-unanimous vote. In both states, the threshold in non-capital cases is 10 to 2.* Arguably, Herrera had to go to jail for the crime of living in Oregon.

The Supreme Court has allowed this conflict between federal and state law (as well as between state law and conventional wisdom) to persist for more than 40 years, during which time it has come up with a mishmash of seemingly arbitrary rules about what constitutes a legal trial. A jury of six, the Supreme Court has decided, is constitutional (Williams v. Florida, 1970). A jury of five, however, is not constitutional (Ballew v. Georgia, 1978). In a jury of six, conviction must be unanimous (Burch v. Louisiana, 1979). But in a jury of 12, conviction does not have to be unanimous (Johnson v. Louisiana and Apodaca v. Oregon, 1972). (At the time of these decisions, Louisiana required a 9-to-3 vote to convict in non.capital cases, which the court upheld as constitutional. The state has since changed its threshold to 10 to 2.)