Del. Code tit. 21, § 2145

All school buses which transport pupils of any public, parochial or private school of this State shall receive a special inspection twice yearly at such time and place as specified by Department regulations. At such inspection each school bus shall be inspected by the Department to determine if it is safe and fit for operation and properly equipped, and a special check shall be accomplished with respect to specific school bus safety features in accordance with the rules and regulations adopted by the Department.