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Immunity - Grant by the court, which assures someone will not face prosecution in return for providing criminal evidence.

Impeachment - A criminal proceeding against a public official.

Impeachment of a Witness - An attack on the credibility (believability) of a witness, through evidence introduced for that purpose.

Implied contract - A contract not created or evidenced by the explicit agreement of the parties but one inferred by law; as the use of electric power in your home implies a contract with the electric company.

Inadmissible - That which, under the rules of evidence, cannot be admitted or received as evidence.

Incapacity - Lack of legal ability to act; disability, incompetence; lack of adequate power.

Incarceration - Imprisonment in a jail or penitentiary.

Incompetent - One who lacks ability, legal qualification, or fitness to manage his own affairs.

Indictment - A written accusation by a grand jury charging a person with a crime.  

Indigent - Needy or impoverished.  A defendant who can demonstrate his or her indigence to the court may be assigned a court-appointed attorney at public expense.

Initial appearance - The defendant comes before a judge within hours of the arrest to determine whether or not there is probable cause for his/her arrest.  Also called “First Appearance.”

Information - Accusatory document, filed by the prosecutor, detailing the charges against the defendant.  An alternative to an indictment, it serves to bring a defendant to trial.

Infraction - A violation of law not punishable by imprisonment.  Minor traffic offenses generally are considered infractions.

Injunction - A prohibitive order or remedy issued by the court at the suit of the complaining party, which forbids the defendant to do some act which he/she is threatening or attempting to do.  Conversely, it may require him/her to perform an act which he/she is obligated to perform but refuses to do.

Insolvent - When the total debt of an entity is greater than all of its property.

Instructions - A judge’s explanation to the jury before it begins deliberations of the question it must answer and the applicable law governing the case.  Also referred to as the “Charge.”

Intentional Tort - Wrong perpetrated by one who intends to break the law.

Interlocutory - Temporary; provisional; interim; not final.

Interrogatories - A set or series of written questions propounded to a party, witness, or other person having information or interest in a case; a discovery device.

Intervention - An action by which a third person who may be affected by a lawsuit is permitted to become a party to the suit.

Issue - 1.  The disputed point in a disagreement between parties in a lawsuit.  2.  To send out officially, as in to issue an order.