http://www.cafeoutdoors.com/ubb/showflat.php?Cat=0&Number=240640&an=0&page=0#240640

In RSMO 571.030 Weapons Offenses, they changed it to read just "knife" instead of switchblade. State law treats them as a regular knife now.

" 571.030. 1. A person commits the crime of unlawful use of weapons if he or she knowingly:

(1) Carries concealed upon or about his or her person a knife, a firearm, a blackjack or any other weapon readily capable of lethal use; or ..."