Bedbugs in FourPlex - Who Pays?

[Mark S.]

My buddy's girlfriend lives in a 4-plex. They recently realized she has bedbugs in her bedroom. She immediately called the landlord to report the issue and the landlord scheduled pest control to take a look the next evening. The state is Kentucky. Questions: 1.) Who is responsible for the cost? 2.) If "it depends," where is the burden of proof? 3.) About how much is the all-in cost for treatment, on average. Thanks. 3.)