A county board may not knowingly hire or retain any individual who has been convicted of a crime involving: An offense under § 3–307 or § 3–308 of the Criminal Law Article or an offense under the laws of another state that would constitute a violation of § 3–307 or § 3–308 of the Criminal Law Article if committed in the State; Child sexual abuse under § 3–602 of the Criminal Law Article, or an offense under the laws of another state that would constitute child sexual abuse under § 3–602 of the Criminal Law Article if committed in this State; or A crime of violence as defined in § 14–101 of the Criminal Law Article, or an offense under the laws of another state that would be a violation of § 14–101 of the Criminal Law Article if committed in this State. A local school system contract shall provide that a contractor or subcontractor for the local school system may not knowingly assign an employee to work on school premises with direct, unsupervised, and uncontrolled access to children, if the employee has been convicted of a crime identified under subsection (a) of this section.