Most often, you will be called to serve on a trial jury, generally made up of 12 individuals for criminal trials and 6 for civil trials. File a report with your local police department.If the police file charges, the court and Office of State's Attorney will become involved automatically. Work out any differences with other jurors through complete and fair discussion of the evidence and the judge's instructions. Tell the facts in a logical way. In most states, if you don't show up they can send the sheriff or whoever is the local police for the type of court you have jury duty for. You wait in line to get a new number. They'll send you another one and if you bail on it the sheriff comes and serves you papers. The Maryland sentencing guidelines cover most criminal cases originating in a Circuit Court. Find out your trial schedule.