The prohibitions set forth in Section 10.14.010 of this chapter shall not apply when drug paraphernalia are displayed for sale or offered for sale in a room the entrance to which is posted by a conspicuous sign clearly indicating that drug paraphernalia are displayed for sale or offered for sale therein and that minors may not enter such room unless accompanied by a parent or legal guardian. (Ord. 1418 NCS §1 (part), 1980.)