The legislature may from time to time by local act authorize or require the Jefferson county commission to:
(a) Prohibit the overgrowth of weeds and the storage and accumulation of junk, inoperable motor vehicles and other litter;
(b) Implement, administer and enforce said prohibition and;
(c) Assess criminal penalties for violations thereof. All existing local acts pertaining to Jefferson county relating to the subject of this constitutional amendment enacted prior to the adoption and ratification of this constitutional amendment are hereby validated.