21.— The jurisdiction of the District Court under this Act shall, in relation to a place that is a structure, stall or vehicle, be exercised by a judge for the time being assigned to the district court district in which—

(a) the structure, stall or vehicle concerned was alleged to have been used for the sale or advertisement of a psychoactive substance for human consumption or an object for use in cultivating by hydroponic means any plant in contravention of section 17 of the Act of 1977, or as may be appropriate, the importation or exportation of a psychoactive substance, or

(b) the structure, stall or vehicle is kept when not in use.