Defenses Flashcards
Insanity - General Rule
If the defendant is insane at the time of his criminal act, no criminal liability will be imposed.
What are th four tests for Insanity?
- M’Naughten Test
- MPC Test
- “Irrestible Impulse” Test
- Durham Rule
The M’Naghten test focuses on…
The defendant’s reasoning abilities.
Under this test, a defendant is relieved of criminal responsibility upon proof that, at the time of commission of the act, he was laboring under such a defect of reason from a disease of the mind as not to know the nature and quality of the act he was doing, or if
he did know it, not to know that what he was doing was wrong.
Disease of the mind includes all mental abnormalities, but
not a psychopathic personality.
Under the irresistible impulse test
a defendant will be found not guilty where he had a mental disease that kept him from controlling his conduct.
Under the Durham (or new hampshire) rule, also known as
the “product” rule…
a defendant is not criminally responsible if his unlawful act was the product of a mental disease or defect (meaning it would not have been committed “but for” the defect or disease).
Under the Model Penal Code test (or substantial capacity)…
a person is not responsible for criminal conduct if, at the time of such conduct, as a result of mental disease or defect, he lacked substantial capacity to appreciate the criminality (wrongfulness) of his conduct or to conform his conduct to the requirements of law.
Some jurisdictions allow the defense of diminished capacity, which is
Short of insanity, to prove that as a result of a mental defect, the defendant did or did not have a state of mind that is an element of the offense.
When pleading diminished capacity, the defense is used to negate a specific mental state required for the particular crime.
Intoxication
Voluntary or involuntary intoxication (whether brought about by alcohol or by narcotic drugs) is a defense to a crime when it negates the existence of an element of the crime.
Voluntary Intoxication may be a valid defense if…
Under the prevailing view, voluntary intoxication may be a valid defense for a specific intent crime if it negates the requisite mental state, and may negate a purposeful or knowing mental state.
However, voluntary intoxication is not a defense to general intent crimes and will not negate recklessness, negligence, or strict liability.
Involuntary Intoxication is a defense to a crime, even if…
It does not negate an element of the crime, under the same circumstances as insanity.
Self-Defense
If a person has a reasonable belief that he is in imminent danger of unlawful bodily harm, he may use that amount of force in self-defense that is reasonably necessary to prevent such harm, unless he is the initial aggressor.
The initial aggressor can regain the right of self-defense in either of two ways:
- Upon complete withdrawal perceived by the other party; or
- Escalation of force by the victim of the initial aggression.
Defense of a Third Person
(Majority and Minority Rule)
Generally, a person is justified in using force to defend a third person to the same extent that that person would be justified in using force to defend himself.
The majority rule focuses on the reasonableness of the defendant’s belief. If the defendant was mistaken, the defendant may nonetheless claim the defense of others.
The minority rule is that the defendant has no more right to use deadly force than the third person ostensibly being protected.
Defense of Property
Reasonable, non-deadly force is justified in defending one’s property from theft, destruction, or trespass where the defendant has a reasonable belief that the property is in immediate danger and no greater force than necessary is used.
Necessity
Reasonable force is justified to avoid imminent injury resulting from natural (non-human) forces or where an individual reasonably believes that his criminal conduct is necessary to avoid a “greater harm” that would result from compliance with the law (e.g., A kills B to save C and D).
This defense also protects military personnel acting within their duties and public executioners.