Certain items, like firearms and explicitly listed illegal objects such as brass
knuckles or crossbows, always fall under the legal definition of a weapon.
Others, like pocket knives or hunting knives, are considered weapons if they
are "used, designed to be used, or intended for use in causing death or injury
to any person or for the purpose of threatening or intimidating any person." The Crown Attorney must prove that the item meets this definition or falls within a list of prohibited weapons to establish its classification as a weapon.
A purpose dangerous to the public’s peace involves disrupting the "normal
state of society" and disturbing "the general peace and order of the realm as
provided for by law." It signifies "unquiet and harmful behavior towards the
Queen and her people," according to various legal definitions.
Possession of weapons in one's home or a private place does not preclude a
finding of a purpose dangerous to the public peace. This applies even if the
weapon's use, giving rise to the charge, occurs entirely in private.
The Crown must demonstrate that the accused not only possessed the weapon but did so with the added purpose of disturbing the peace or committing a crime. If the accused was too intoxicated to form the specific intent required for the full offense, they may be found not guilty.