Rule 38 preserves the right to a jury trial in civil cases, requiring a specific demand within 14 days after the last pleading directed to the issue. By serving jury duty you are participating in the administration of justice.The grand jury has a long and honorable tradition. It was recognized in the Magna Carta, the first English constitutional document, which. These thoughts were first presented in the form of a speech delivered to the New York. Most trial juries are "petit juries", and usually consist of twelve people. Day One: a federal criminal jury trial begins with twelve jurors and two alternates. Huge juries of hundreds of volunteers would listen to evidence from both sides and reach a verdict.