It seems they should all be the same number.
Family Law Attorney
In Florida, most juries have six jurors with one alternate (two if its a multi-day trial). For capital cases in Florida, however, juries have twelve members and two alternates.
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Criminal Defense Attorney
All juries in Florida, except death penalty cases, have 6 jurors. All others are spare jurors just in case something happens to the main jurors. Death penalty cases have 12. Some other states and the federal government have 12 jurors for all trials.
Ms. Stockton is correct. The amount of jurors depends on the severity of the crime charged. When an accused is facing a capital offense, more people are on the jury. There are some who believe that the idea that 12 people are required for capital offenses originated from the idea of 12 apostles in the bible. There is a good book on the Florida jury system on amazon.
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