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Offences Against Public Policy, § 23. No person shall wear or carry in this state any dirk, bowie-knife, butcher knife, dagger, razor, sword-in-cane, air-gun, billy, brass or metal knuckles, slung-shot, pistol or fire-arms of any description, or other weapons of like kind and description concealed upon his person: provided, that officers or watchmen whose duties require them to make arrests or to keep and guard prisoners or property, together with the persons summoned by such officers to aid them in the discharge of such duties, while actually engaged in such duties, are exempted from the provisions of this and the two following sections. § 24. Any person convicted of a violation of the provisions of the preceding section shall be fined not less than ten nor more than twenty dollars, or be imprisoned not exceeding three months, and the weapon so found concealed shall be confiscated. . . § 26. No negative allegations of any kind need be averred or proved in any complaint under the preceding three sections, and the wearing or carrying of such concealed weapons or weapons shall be evidence that the wearing or carrying of the same is unlawful; but the respondent in any such case my show any fact that would render the carrying of the same lawful under said sections.