Cal. Civ. Code § 1954.604

Entry to inspect a tenant’s dwelling unit shall comply with Section 1954. Entry to inspect any unit selected by the pest control operator and to conduct followup inspections of surrounding units until bed bugs are eliminated is a necessary service for the purpose of Section 1954. Tenants shall cooperate with the inspection to facilitate the detection and treatment of bed bugs, including providing requested information that is necessary to facilitate the detection and treatment of bed bugs to the pest control operator.