DARS implements its general powers and duties pursuant to its statutory authority promulgated in Texas Human Resources Code, Chapter 73 (relating to Interagency Council on Early Childhood Intervention Services); Chapter 81 (relating to Texas Commission for the Deaf and Hard of Hearing); Chapter 91 (relating to Texas Commission for the Blind); Chapter 111, Texas Rehabilitation Commission; and Chapter 117 (relating to Department of Assistive and Rehabilitative Services); as well as pursuant to federal authority.