Maryland Criminal Law Section 4-105

      (a)      A person may not sell, barter, display, or offer to sell or barter:

            (1)      a knife or a penknife having a blade that opens automatically by hand pressure applied to a button, spring, or other device in the handle of the knife, commonly called a switchblade knife or a switchblade penknife; or

            (2)      a device that is designed to propel a knife from a metal sheath by means of a high-compression ejector spring, commonly called a shooting knife.

      (b)      A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 12 months or a fine of not less than $50 and not exceeding $500 or both.