Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 578.435. Weapon defined--weapons owned or in possession of gang members may be confiscated--weapon deemed a nuisance and destroyed by court order, when

1. As used in this section and section 578.437, the term “weapon” means any firearm, concealable firearm, blackjack, explosive weapon, gas gun, knife, knuckles, machine gun, projectile weapon, rifle, short barrel, shotgun, or switchblade knife, as defined in section 571.010.

2. Any weapon which is owned or possessed by a member of a criminal street gang for the purposes of the commission of an offense enumerated in subdivision (2) of section 578.421 may be confiscated by any law enforcement agency or peace officer as defined in section 590.100. If the law enforcement agency or peace officer believes that the return of the weapon confiscated has been or will be used in criminal street gang activity or that the return of the weapon would be likely to result in endangering the safety of others, the law enforcement agency or peace officer may initiate a petition in circuit court to determine if the weapon should be returned or declared a nuisance. If the court declares such weapon to be a nuisance, the weapon shall be destroyed.