It shall be unlawful for any operator, owner or any employee managing or conducting
any business or other establishment to knowingly permit a juvenile to linger, stay,
congregate, move about, wander or stroll upon the premises of the establishment during
curfew hours. It is a defense to prosecution under Section 21-210 of this article that the owner, operator, or employee notified the police department
that a juvenile was present on the premises of the establishment during curfew hours
and refused to leave after being asked to leave the premises.