For the purpose of this chapter, it shall not be essential that the nuisance be created or contributed to by the owners, or tenants, or their agents, or representatives, but merely that the nuisance be enacted or contributed to by licensees, invitees, guests, or other persons for whose conduct the owner or operator is responsible, or by persons for whose conduct the owner or operator is not responsible, but by the exercise of reasonable care, the owner or operator ought to have become aware of.
(1996 Code, 7-2.04)