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Iowa - Crime Control and Criminal Acts - Definitions. 702.7.
  Dangerous weapon. A "dangerous weapon" is any instrument
  or device designed primarily for use in inflicting death
  or injury upon a human being or animal... Dangerous
  weapons include, but are not limited to, any offensive
  weapon... firearm, dagger, razor, stiletto, switchblade
  knife, or knife having a blade exceeding five inches in
  length.
- 724.4. Carrying weapons.
1. Except as provided in this section, a person who goes
  armed with a dangerous weapon concealed on or about the
  person... commits an aggravated misdemeanor.
2. A person who goes armed with a knife concealed on or about
  the person, if the person uses the knife in the commission
  of a crime, commits an aggravated misdemeanor.
3. A person who goes armed with a knife concealed on or about
  the person, if the person does not use the knife in the
  commission of a crime:
a. If the knife has a blade exceeding eight inches in length,
  commits an aggravated misdemeanor.
b. If the knife has a blade exceeding five inches in length
  but not exceeding eight inches in length, commits a
  serious misdemeanor.
4. Subsections 1 through 3 do not apply to any of the
  following:
a. A person who goes armed with a dangerous weapon in the
  person's own dwelling or place of business...
b-d. [officials]
h. A person who carries a knife used in hunting or fishing,
  while actually engaged in lawful hunting or fishing.
i. [valid permit]
- 724.1. Offensive Weapons... 5. A ballistic knife. A
  ballistic knife is a knife with a detachable blade which
  is propelled by a spring-operated mechanism, elastic
  material, or compressed gas... Section 724.3. Any
  person... who knowingly possesses an offensive weapon
  commits a class "D" felony... (Also see Section 724.4.
  carrying weapons.)

 Iowa Case Law:
- "Intent was essential element in determining whether
  defendant who was found in possession of ten-inch kitchen
  knife was guilty of crime of carrying a concealed weapon."
  (1974)
- "Defendant, who was found carrying two pocketknives, one in
  pocket and one on chain around his neck under his shirt,
  could not be convicted of carrying concealed dangerous
  weapons without proof of intent to use knives as weapons."
  (1966)
- "Intended illegal use of knife cannot be inferred from
  defendant's bad reputation or former convictions for
  assault." (1966)
- "Actual intent of user is not the issue in deciding whether
  instrument or device is dangerous..." (1984)