In this section, “sensitive location” has the meaning stated in § 6–111 of the State Government Article. This subsection does not apply to a State or local correctional facility or a detention facility in a District Court or circuit court house. A public school, a public library, or a unit of the Executive Branch of State or local government that operates at a sensitive location shall deny access to any portion of the sensitive location that requires a security screening or is not accessible to the general public to any individual who is seeking access for the purpose of enforcing federal immigration law, unless: the individual presents a valid warrant issued by a federal court; or exigent circumstances exist.