Written by attorneys · grounded in primary & secondary sources — see below
An instrument or object used in a manner calculated or likely to cause death or serious bodily injury.
Sources & Authorities
How it applies
Common Examples
6
Knife Directed at Heart
Wilma Wright became enraged during an argument and plunged a kitchen knife into Wallace Webb's chest. The prosecution introduced evidence that the blade struck a vital area. The factfinder could infer from the intentional use of the knife that Wilma acted with malice aforethought.
Baseball Bat in Assault
Willow Walker swung a metal baseball bat at Wanda Weaver's head during a street confrontation. The blow fractured Wanda's skull. Under the Model Penal Code, Willow's purposeful use of the bat as a deadly weapon elevated the charge to aggravated assault.
Handgun in the Home
Willa Whitman kept a loaded handgun in her bedside drawer for protection after repeated break-ins. A local ordinance later banned all handgun possession inside city limits. Whitman challenged the ban as violating her individual right to keep and bear arms.
Select any source to read its text and confirm it supports the definition.
Statutes
Federal Rules
Model Codes
Common Law
Restatements
Casebooks
Hornbooks
Course Outlines
Study Supplements
Lead Pipe as Deadly Weapon
Wallace Webb struck Willow West repeatedly with a lead pipe during a robbery. The blows caused fatal head trauma. The factfinder could permissively infer that Wallace intended to kill because he intentionally used an instrument likely to cause death.
Armed Entry at Night
Wanda Weaver entered a residence at night carrying a loaded revolver to commit theft. She was apprehended before completing the theft. Because she was armed with a deadly weapon during the course of the burglary, the offense was graded as a felony of the second degree.
Editorial Using Metaphor
Wellesley Media published an editorial criticizing a public official and describing corruption as a dangerous weapon. The official sued for libel. The court applied actual-malice standards to the publication that employed the term weapon metaphorically.
New York Times v. Sullivan376 U.S. 254 (1964)
Common questions
Frequently Asked
4
Does use of a deadly weapon automatically prove intent to kill at common law?+
No. The use of a deadly weapon directed at a vital body part merely permits the factfinder to draw an inference of intent to kill. The inference remains permissive and the prosecution must still prove malice aforethought beyond a reasonable doubt.
Supporting sources
How does the Model Penal Code treat assault with a deadly weapon?+
A person commits aggravated assault by attempting to cause or purposely or knowingly causing bodily injury to another with a deadly weapon. The offense is graded as a felony of the third degree.
Supporting sources
When does carrying a weapon elevate burglary to a higher degree under the Model Penal Code?+
Burglary becomes a felony of the second degree if the actor is armed with explosives or a deadly weapon during the course of committing the offense. The same grading applies when the burglary occurs in a dwelling at night.
Supporting sources
Does the Second Amendment protect possession of every type of weapon?+
The Second Amendment protects the individual right to keep and bear arms commonly used for self-defense, but the right is not unlimited. Prohibitions on possession by felons and the mentally ill, and restrictions on certain dangerous weapons, remain valid.
Supporting sources
410 U.S. 113 (1973)Constitutional Law
…points pricked out in terms of the taking of property; the freedom of speech, press, and religion; the right to keep and bear arms; the freedom from unreasonable searches and seizures; and so on. It is a rational continuum which, broadly speaking, includes a freedom from all substantial arbitrary impositions and…