Miss. Code Ann. § 69-17-101

Every person, except a bona fide merchant, who owns or possesses an instrument designed to project a tranquilizer or drug by means of compressed gas, explosion, or by mechanical means, into livestock for the purpose of rendering the animal docile, by whatever name known, shall register same within thirty days with the commissioner of public safety on forms to be provided by him. Any person hereafter coming into possession of or owning such instrument shall immediately register same with the commissioner of public safety. The commissioner shall make forms available to the general public at all Mississippi Highway Safety Patrol substations.