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No, the defendant is being tried on the charge that is before the jury, and the past history of the defendant does not, and should not be applied.
Yes, it is.
Yes, in some cases a judge can overrule a jury in a criminal case. This is known as a judgment notwithstanding the verdict (JNOV) and typically occurs when the judge believes the jury's decision is not supported by the evidence presented during the trial.
In a criminal trial the jury is the "finder of fact". This means that the jury, as one, determines what to believe and what actually happened. The jury will determine what crime was committed. For example, the jury will determine if a person is guilty of murder or manslaughter.
Grand juries and Petit juries are the two kinds of juries. Grand juries review evidence of criminal action to determine if there is probable cause for bringing charges and if so, issue an indictment. Petit juries review evidence in both civil and criminal trials to determine the facts and render verdicts either for or against the parties in civil actions or guilty or not guilty in criminal actions.
A criminal information is a criminal charge that is brought by prosecutor rather than by a grand jury. A charge from a grand jury is called an indictment.
The Grand Jury
A grand jury is a group of citizens (often 23) that is empowered to investigate potential criminal conduct in order to determine if criminal charges should be brought. Their job is to decide if there is probable cause to believe certain offences were commited. It is called a "grand" jury because it traditionally has more jurors than a trial jury.
Approximately 2-3 of criminal cases go to jury trial.
The role the House of Representatives plays in impeachments can best be compared with that of a grand jury. A grand jury investigates criminal conduct and determines whether criminal charges should be brought.
It means that they have been summoned to possibly serve as a member of a jury in either a criminal or a civil trial. Not all persons summoned for jury duty will be called and not all will actually serve on one.