Omaha, Neb., Rev. Ordinances ch. 42 § 10 (1890)

SEC. 10. It shall be unlawful for any person to wear under his clothes, or concealed about his person, any pistol or revolver, colt, billy, slung- shot, brass knuckles or knuckles of lead, dirk, dagger, or any knife resembling a bowie knife, or any other dangerous or deadly weapon within the corporate limits of the city of Omaha. And any person guilty of a violation of this section shall, on conviction, be fined not exceeding one hundred ($100) dollars for each and every offense; nothing in this section, however, shall be so construed as to prevent the United States marshals and their deputies, sheriffs and their deputies, regular or special police officers of the city, from carrying or wearing such weapons as may be deemed necessary in the proper discharge of their duties. Provided, however, If it shall be proved from the testimony on the trial of any such case, that the accused was, at the time of carrying any weapon as aforesaid, engaged in the pursuit of any lawful business, calling or employment and the circumstances in which he was placed at the time aforesaid were such as to justify a prudent man in carrying the weapon or weapons aforesaid, for the defense of his person, property or family, the accused shall be acquitted. Whenever any police officer shall make an arrest of a person having concealed on or about his person any weapon or weapons, as specified in this section, it shall be such officer's duty to take from such person arrested the weapon or weapons found upon him at the time of his arrest, and to retain the same, to abide such order concerning the same as may be made by the police judge.