Kansas - Article 42. Crimes Against the Public Safety;
   Weapons Control. Section 21-4201. Criminal use of weapons
   is knowingly...
(1) Selling, manufacturing, purchasing, possessing, or
   carrying any... knife commonly referred to as a
   switchblade knife, which has a blade that opens
   automatically by hand pressure applied to a button,
   spring, or other device in the handle of the knife, or any
   knife having a blade that opens or falls or is ejected
   into position by the force of gravity or by an outward,
   downward or centrifugal thrust or movement...
(2) carrying concealed on one's person, or possessing the
   same with intent to use unlawfully against another, a
   dagger, dirk... dangerous knife, straight-edged razor,
   stiletto, or any other dangerous or deadly weapon or
   instrument of like character, except that an ordinary
   pocket knife with no blade more than four inches in length
   shall not be construed to be a dangerous knife, or a
   dangerous or deadly weapon or instrument...

  Kansas Case Law:
- "[city] Ordinance more restrictive than 21-4201 upheld."