28-1201. Terms, defined.
For purposes of sections 28-1201 to 28-1212.04, unless the context otherwise requires:
(1) Firearm means any weapon which is designed to or may readily be converted to expel any projectile by the action of an explosive or frame or receiver of any such weapon;
(3) Handgun means any firearm with a barrel less than sixteen inches in length or any firearm designed to be held and fired by the use of a single hand;
(5) Knife means any dagger, dirk, knife, or stiletto with a blade over three and one-half inches in length or any other dangerous instrument capable of inflicting cutting, stabbing, or tearing wounds;
28-1202. Carrying concealed weapon; penalty; affirmative defense.
(1)(a) Except as otherwise provided in this section, any person who carries a weapon or weapons concealed on or about his or her person, such as a handgun, a knife, brass or iron knuckles, or any other deadly weapon, commits the offense of carrying a concealed weapon.
(b) It is an affirmative defense that the defendant was engaged in any lawful business, calling, or employment at the time he or she was carrying any weapon or weapons and the circumstances in which such person was placed at the time were such as to justify a prudent person in carrying the weapon or weapons for the defense of his or her person, property, or family.
(2) This section does not apply to a person who is the holder of a valid permit issued under the Concealed Handgun Permit Act if the concealed weapon the defendant is carrying is a handgun.
(3) Carrying a concealed weapon is a Class I misdemeanor.
(4) In the case of a second or subsequent conviction under this section, carrying a concealed weapon is a Class IV felony.
....Therefore under the wording of the law you may be charged with the offense of carrying a concealed weapon. I know two law enforcement officers and both have said they would not charge a person if they were carrying a baton concealed but they cannot speak for all officers. Some cops are just going to be dicks and will throw the book at you and others won't bother. Now if you did commit a serious crime in addition to carrying the baton they would of course throw the whole book at you.
But just remember that almost any object can be a deadly weapon if employed for that purpose such as a pen or pencil. Is the cop going to arrest you for carrying a pencil in your pocket? No. But if you try to stab someone with that pencil they will then in addition to the murder/attempted murder charges add carrying concealed weapon to the list of charges.