A PETIT jury is a trial jury for both civil and criminal cases. The petit jury listens to the evidence offered during a trial and returns a verdict.In civil cases, the jury can consist of as few as six jurors or as many as twelve. History of Jury Duty. In a criminal case all jurors must agree on the verdict. Your Role as a Juror. Who may be called as a juror? Included on this page are forms for filing civil complaints, private criminal complaints and notices of settlement when cases are privately resolved. At the end of the day or trial, your jury obligation has been fulfilled for three years. Please read over your jury summons carefully.