There is no specific legal blade length for a concealed carry knife in Missouri. However, the law does state that a person must not carry "any dangerous or deadly weapon concealed." This means that the knife must be carried in a way that is not likely to cause injury to others. For example, a knife would be considered concealed if it is carried in a pocket, purse, or backpack. It would not be considered concealed if it is carried in a sheath on the belt or in a visible location on the person's body.
Additionally, the law does state that a person cannot carry a knife with a blade longer than four inches into certain places, such as schools, churches, and government buildings.
