Justification is an excuse. A defendant may prove their innocence through this legal defense. Perhaps the most common example of justification involves self-defense. If someone physically attacks you, then your actions in defending yourself, within certain limits, would be justified.
In New York, there are two general instances involving violence when justification is allowed as a defense. These are when:
1. Such conduct is required or authorized by law or by a judicial decree, or is performed by a public servant in the reasonable exercise of his official powers, duties or functions; or
2. Such conduct is necessary as an emergency measure to avoid an imminent public or private injury which is about to occur by reason of a situation occasioned or developed through no fault of the actor, and which is of such gravity that, according to ordinary standards of intelligence and morality, the desirability and urgency of avoiding such injury clearly outweigh the desirability of avoiding the injury sought to be prevented by the statute defining the offense in issue. The necessity and justifiability of such conduct may not rest upon considerations pertaining only to the morality and advisability of the statute, either in its general application or with respect to its application to a particular class of cases arising thereunder. Whenever evidence relating to the defense of justification under this subdivision is offered by the defendant, the court shall rule as a matter of law whether the claimed facts and circumstances would, if established, constitute a defense.
These instances include someone defending their home or person against another person, a person restraining someone in a professional manner, which includes law enforcement, prison officials, and medical professionals, and parents disciplining children. Often such actions are justified when a person in authority must use force to enforce orderly conduct or when a person is in some way attacked by another.